I’ve spent many summers experimenting with fruit pies that won’t wreck a low-carb day, and this keto strawberry rhubarb pie is the one I keep returning to. The first time I baked it I was surprised at how the tang of rhubarb and the honeyed sweetness of strawberries married cleanly without needing traditional sugar. The aroma that filled my kitchen—bright berry notes with a warm buttered crust—told me I was onto something.
In my kitchen the visual contrast is what sells people first: jewel-toned strawberry slices and pink-ruby rhubarb peeking through a flaky, golden crust. The crust itself surprises many keto skeptics—flaky, tender layers achieved with a cheese-based dough that holds up to a juicy filling. When I slice into it, the steam smells like summer and the first bite balances tartness and gentle sweetness.
What I’ll share below is practical: why the mozzarella matters for structure, how to keep the filling from going soggy, options if you don’t use dairy or nuts, and the sweeteners that work best. I tested this recipe over different ovens and with a handful of sweeteners so you won’t have to—just bring your favorite plate and a good fork.
Everything Required for Keto Strawberry Rhubarb Pie
Before you start, lay out your ingredients and tools at room temperature where required—this makes the dough more cooperative and ensures even melting when you combine the cheese. Below I talk through each component so you understand its role and possible swaps.
- Mozzarella (shredded, melted) – Provides elasticity and structure to the crust; it helps bind the low-carb flours and creates a surprisingly flaky texture.
- Almond flour – Adds a tender, nutty base; if you need a nut-free option use sunflower seed flour in its place.
- Coconut flour – Absorbs moisture and gives body to the crust; it works with the cheese to create that pastry-like crumb.
- Butter (unsalted) – Adds richness and laminates the dough for flakiness; for dairy-free swaps, see the dairy-free section below.
- Eggs – Bind the dough and contribute to tenderness; aquafaba can replace eggs in vegan versions.
- Rhubarb and strawberries – The flavor core: rhubarb brings bright acidity, strawberries bring rounded sweetness; balance the two to keep the filling lively.
- Psyllium husk powder – Thickens the filling without carbs and helps prevent a runny pie when fruit releases juices.
- Granulated sugar-substitute – Any keto-friendly granular sweetener suitable for baking will work; more on choices below.
- Salt and vanilla – Salt amplifies flavors; vanilla softens the tart edge and rounds out the fruit.
- Tools – Have a 9-inch pie pan, parchment paper for rolling, a microwave-safe bowl or double boiler for melting cheese, and a bench scraper or spatula handy for kneading.
How to Prepare Keto Strawberry Rhubarb Pie
Follow these steps in order so the dough chills properly and the filling doesn’t turn the crust soggy. Chilling between steps makes the crust far easier to roll and results in a flakier texture.
- Combine your dry flours and salt so they’re evenly distributed before adding fats to avoid overworking the dough.
- Melt the butter and stir it into the dry mix quickly so the fats coat the flour particles, then add the eggs and mix until just combined.
- Melt the shredded mozzarella gently—either in short microwave bursts or over a double boiler—until it’s silky but not browned, then incorporate it into the dough and knead between parchment sheets until smooth.
- Divide the dough for top and bottom, chill thoroughly, then roll each piece between parchment to the size of your pie pan to prevent sticking and tearing.
- Transfer the bottom crust to the pan, patch any small cracks by pressing with your fingers, then blind-chill it briefly while you prepare the filling.
- Toss the sliced fruit with sweetener, vanilla, salt, and psyllium husk so the thickener starts absorbing juice before the pie goes into the oven.
- Fill the prepared crust, dot the top with small pieces of butter for flavor and sheen, add the top crust, and vent with several slits so steam escapes cleanly while baking.
- Bake until the crust is golden and the filling is bubbling and slightly set; allow the pie to cool for at least a couple of hours so the filling firms and slices cleanly.
Keeping the Crust Flaky with a Cheese-Based Keto Dough
The secret that took me a few tries was treating the melted cheese like a laminating agent. Melt the mozzarella slowly and work it into the dry flours while it’s warm—this helps the fats distribute and produces layers as the dough cools. Handle the dough minimally and keep it cold between steps to preserve those layers.
- Melt cheese gently and combine it immediately with the butter–flour mixture so it emulsifies rather than seizes.
- Knead briefly only until uniform; overworking warms the dough and collapses the flake-causing pockets.
- Chill after forming and again after rolling; a cold dough rolls out smoother and holds flake during baking.
- Roll between parchment to prevent sticking and to maintain even thickness—this also reduces the need to add extra flour that can toughen the crust.
For a deeper look at technique and variations on cheese-based keto doughs, see this guide:
Learn more about creating a flaky cheese-based keto dough
Preventing a Soggy Filling: Balancing Strawberry and Rhubarb Moisture
Strawberries and rhubarb both release water as they cook. Controlling that moisture is what keeps your crust crisp instead of limp. I always pre-treat the fruit and use a binding agent that won’t spike carbs.
- If using frozen fruit, thaw completely and drain in a fine mesh; press gently to remove excess liquid before tossing with sweetener.
- Toss the fruit with your sweetener and a small amount of psyllium husk so the sweetener draws out surface moisture and the psyllium begins to thicken it before it goes into the oven.
- Don’t overfill the pie; a slightly shallow mound gives the juices room to bubble without overflowing and compromising the crust.
- If the filling looks too wet before baking, add a touch more psyllium or a small amount of almond flour to absorb extra liquid—mix gently so fruit pieces stay intact.
Sweetener Choices Beyond Stevia: Best Keto-Friendly Options
Stevia can be an option, but many bakers prefer alternatives for a cleaner, more sugar-like mouthfeel. Each sweetener behaves differently when heated, so choose based on flavor, texture, and any cooling effect you’re willing to accept.
Allulose gives a very syrupy, brown-like caramelization and tastes very close to sugar with minimal cooling effect, making it excellent for fruit pies. Erythritol is widely available and granular like sugar but can produce a noticeable cooling sensation; mix it with a small amount of monk fruit to round the flavor. Monk fruit extract is concentrated and often blended with erythritol; it provides a neutral sweetness without aftertaste.
Conversion tips: stick to the sweetener manufacturer’s guidance, and when in doubt taste the fruit-sweetener mix before filling the pie so you can adjust sweetness to your preference.
For more in-depth explanation of sweetener options suited to baking, see this resource:
Explore more about best keto-friendly sweeteners
Dairy-Free and Vegan Options for This Pie
It’s possible to make this pie without dairy or eggs, but expect textural trade-offs and be prepared to adjust chilling and bake time. Below are practical swaps that keep the pie low-carb and accessible.
- Vegan cheese alternatives – Use a cashew-based or almond-based meltable cheese designed for baking; they won’t always mimic mozzarella’s stretch but can provide fat and structure.
- Butter replacements – Use a solid plant-based shortening or coconut oil for richness; solid fat coldness is key for flakiness.
- Egg replacements – Aquafaba (the liquid from canned chickpeas) works as a binder; reduce liquid elsewhere if your aquafaba is very watery.
- Thickeners – Increase psyllium slightly if you lose binding power without eggs; tapioca starch is not keto-friendly but small amounts of glucomannan can help in a low-carb vegan build.
For more options and step-by-step swaps tailored to vegan baking, this guide is helpful:
For those looking to make this pie vegan, check out our guide on dairy-free and vegan options
How to Store Your Keto Strawberry Rhubarb Pie
Proper storage preserves both the crust texture and the bright fruit flavor. The key is to cool fully before covering so condensation doesn’t soften the pastry.
- Cool the pie completely at room temperature for a couple of hours before refrigerating to let the filling set.
- Store in an airtight container in the refrigerator for up to five days; avoid sealing while still warm.
- To freeze, wrap slices individually in parchment and foil, or flash-freeze the whole pie then wrap tightly; freeze for up to three weeks.
- Reheat gently to refresh the crust—use a low oven or toaster oven rather than the microwave to restore crispness.
Nutrition: Carb Count, Servings, and Ingredient Swaps
For anyone tracking net carbs, portion control matters. This pie is designed to yield ten generous slices; the approximate nutrition per slice (one-tenth of the pie) is shown so you can fit it into your daily targets.
Per serving (1 of 10): roughly 258 calories, 16.5 grams fat, 11.6 grams carbohydrates, and 5.3 grams protein. If you want to shave carbs further, reduce the strawberry ratio or replace some strawberries with lower-carb berries like raspberries or blackberries. Also consider using allulose which can allow you to lower total sweetener without losing mouthfeel.
If you’d like a more detailed breakdown of swaps and how they affect macros, check this page:
Discover the full nutrition breakdown and ingredient swaps
Pro-Tips
- I always chill the dough twice: once after shaping and again after rolling. It makes a dramatic difference in flake and handling.
- If the mozzarella starts to brown while you’re melting it, lower the heat and stir—overheated cheese can become grainy.
- When using frozen fruit, I press the thawed slices between paper towels before tossing with sweetener to remove extra water.
- Let the pie rest at least two hours before slicing; it slices cleaner and the flavors knit together while cooling.
Troubleshooting
- I noticed the dough felt tacky — if that happens, chill it longer; it firms up and is much easier to roll.
- If your crust is pale after baking, tent it loosely with foil in the final minutes to prevent over-browning while the filling finishes setting.
- If the filling is weeping after a slice, next time add a touch more psyllium or reduce the strawberry proportion slightly to lower moisture.
- If the cheese separates, it was likely overheated; melt more gently next time and incorporate while warm, not hot.
Variations
- Reduce strawberries and add raspberries for a tarter, lower-carb profile.
- Stir a splash of lemon juice into the filling for brighter acidity without extra sweetener.
- Top slices with lightly whipped mascarpone or coconut cream for a luxurious finish that keeps carbs low.
- Make mini-tarts using the same dough to shorten bake time and create portable portions.
Serving suggestion: let slices come to just below room temperature and serve with a spoonful of unsweetened whipped cream or a dollop of full-fat Greek yogurt for a creamy counterpoint that stays low-carb.
Frequently Asked Questions
Can I use frozen strawberries or rhubarb for this recipe?
Yes, you can use frozen strawberries or rhubarb! Just be sure to thaw them first and drain any excess moisture to prevent a soggy filling.
What can I use as a substitute for almond flour?
If you’re looking for a nut-free option, you can use sunflower seed flour instead of almond flour in this recipe.
How do I ensure my keto pie crust stays flaky?
To keep your crust flaky, make sure to chill your cheese-based dough and roll it out between parchment paper. This helps keep it from sticking and creates a beautiful crust texture!
What sweeteners can I use instead of granulated sugar-substitute?
You can explore other keto-friendly sweeteners, such as erythritol or monk fruit, as alternatives to granulated sugar-substitutes. Just ensure they are suitable for baking!
How should I store leftovers of the Keto Strawberry Rhubarb Pie?
Store leftovers in the refrigerator for up to 5 days or freeze for up to 3 weeks to enjoy later!
Keto Strawberry Rhubarb Pie
Ingredients
Method
- In a medium-sized bowl, combine the coconut flour and almond flour, and salt. Note if making the nut-free option use sunflower seed flour in place of almond flour and set it aside.
- Melt the unsalted butter and set aside.
- To the dry ingredients, add the melted butter and combine quickly.
- Next, add the two whole eggs and combine.
- Melt the mozzarella cheese in the microwave using 30-second intervals, mixing in between until fully melted but not crispy. This should take about three rounds in the microwave, depending on the power of your microwave.
- Once it comes out of the microwave, mix well until fully incorporated. You can also melt the mozzarella cheese in a double boiler.
- Add the melted mozzarella cheese to the mixture and knead the dough with your hands until all the cheese is blended well into the pie dough.
- Divide the dough in half to make the top and bottom of the pie crust.
- Place the pastry dough in the refrigerator to rest and allow the dough to chill.
- Roll out the dough between two sheets of parchment paper for both the top and bottom of the crust and place back into the refrigerator for another 15 minutes.
- Preheat oven to 350 degrees. Transfer one rolled crust to a 9-inch pie pan.
- Fill the pie with strawberry rhubarb filling and dot the pie with sliced butter.
- Add the top crust and make 5-6 slits to the top of the pie to let the steam vent.
- Bake the pie until the topping is lightly brown, around 35-40 minutes.
- Store leftovers in the refrigerator for up to 5 days or freeze for up to 3 weeks.
- In a large bowl, combine the sliced rhubarb, strawberries, sugar substitute, and vanilla extract.
- Next, sprinkle the salt and psyllium husk powder and combine well.
