![]() |
Real Raspberries, Blackberries and Blueberries Stretched with Zucchini for a Fruity, Lower-Carb Pie
A beautiful mixed berry pie doesn't have to disappear just because you're watching carbohydrates and sugar.
Berries are among the fruits that can fit more easily into a keto lifestyle in sensible portions, but several cups of berries baked into one pie can still add a considerable amount of natural fruit sugar and carbohydrates.
That's where zucchini comes in.
Yes—zucchini!
This Keto Mock Mixed Berry Pie combines real raspberries, blackberries and blueberries with peeled and seeded zucchini. The berries provide the genuine fruit flavor, gorgeous color and tart-sweet juices, while the mild zucchini adds volume to the filling.
Instead of filling the entire pie with berries, we're letting a smaller quantity of real fruit do the flavoring.
And just like a traditional homemade berry pie, this one gets a buttery keto bottom crust and a beautiful woven lattice top.
Why Add Zucchini to Berry Pie?
Zucchini has such a mild flavor that it readily takes on the flavors surrounding it.
When peeled and seeded, the pale flesh becomes almost a blank canvas. As it cooks with berries, lemon juice and sweetener, it absorbs some of those colorful berry juices.
This lets us make a generously filled pie while using considerably less fruit than an all-berry pie of the same size.
That means less natural fruit sugar and fewer carbohydrates from fruit while still keeping real berries in the recipe.
I like this approach better than trying to create an artificial berry flavor. The raspberries, blackberries and blueberries are still there—they just don't have to do all the work!
Keto Mock Mixed Berry Pie
Makes one 9-inch pie
Approximately 8 servings
Mixed Berry Zucchini Filling
3 cups peeled, seeded and diced zucchini
3/4 cup fresh or frozen raspberries
3/4 cup fresh or frozen blackberries
1/2 cup fresh or frozen blueberries
1/2 cup granulated keto-friendly sweetener, or to taste
2 tablespoons fresh lemon juice
1 teaspoon vanilla extract
1 tablespoon butter
1 tablespoon unflavored beef gelatin
1/4 cup cool water
Pinch of salt
Keto Bottom and Lattice Crust
3 cups finely ground blanched almond flour
1/3 cup coconut flour
1/3 cup powdered keto-friendly sweetener
1/2 teaspoon salt
6 tablespoons cold unsalted butter, cubed
2 large eggs
1 teaspoon apple cider vinegar
2 to 4 tablespoons ice-cold water, as needed
For the top:
1 egg beaten with 1 teaspoon water
Preparing the Zucchini
Peel the zucchini completely so there are no pieces of green skin in your berry filling.
Cut the zucchini lengthwise and scoop out the soft, seedy center.
Dice the remaining firm flesh into relatively small pieces.
For this recipe, I prefer smaller pieces than we used for the Mock Apple Pie. We aren't trying to imitate apple slices this time.
Instead, we want the zucchini to disappear visually into the juicy berry filling.
Measure 3 cups of prepared zucchini.
Make the Keto Pie Dough
Combine the almond flour, coconut flour, powdered sweetener and salt in a large bowl.
Cut in the cold butter until the mixture contains small pieces of butter throughout.
Add the eggs and apple cider vinegar.
Mix until a dough begins to form.
Add ice water one tablespoon at a time until the dough holds together. Don't add more water than necessary.
Divide the dough into two portions, making the bottom-crust portion slightly larger.
Form each into a disk and refrigerate for approximately 30 minutes.
Make the Mock Mixed Berry Filling
Place the prepared zucchini, raspberries, blackberries, blueberries, sweetener, lemon juice, butter and salt in a large saucepan.
Cook over medium-low heat for approximately 10 to 15 minutes, stirring gently.
As the berries release their juices, you'll notice the zucchini beginning to take on the beautiful red-purple color of the fruit.
Don't aggressively mash the berries. It's nice to have recognizable pieces of real fruit throughout the finished pie.
Continue cooking until the zucchini is tender and some of the excess liquid has evaporated.
Remove from the heat and stir in the vanilla.
Thicken the Filling with Beef Gelatin
Pour 1/4 cup cool water into a small bowl.
Sprinkle the beef gelatin evenly over the water and allow it to bloom for approximately 5 minutes.
Stir the bloomed gelatin into the warm berry mixture until completely dissolved.
Allow the filling to cool while you prepare the crust.
Remember that gelatin doesn't behave like cornstarch.
The filling will not become extremely thick while it's hot. It will develop more structure as the finished pie cools.
Prepare the Bottom Crust
Preheat the oven to 350°F.
Place the larger portion of chilled dough between two sheets of parchment paper.
Roll it into a circle large enough for a 9-inch pie plate.
Remove the upper sheet of parchment and carefully invert the dough into the pie plate.
Gently press it into the bottom and sides.
If the almond-flour pastry cracks, don't worry. Simply press the pieces back together with your fingers.
Trim the edges and lightly prick the bottom with a fork.
Prebake for approximately 8 minutes.
Remove from the oven and allow it to cool slightly.
Fill the Pie
Spoon the cooled mixed berry and zucchini filling into the partially baked crust.
Spread it evenly.
Take a moment to look at that filling!
The zucchini that started out pale has now absorbed the beautiful juices from the raspberries, blackberries and blueberries.
That's exactly what we want.
Make the Lattice Top
Roll the remaining chilled dough between two sheets of parchment paper.
Chill the rolled dough for approximately 10 minutes to make it easier to handle.
Remove the top sheet of parchment and cut the pastry into strips about 1/2 to 3/4 inch wide.
Lay several strips across the pie in one direction.
Add more strips in the opposite direction, weaving them over and under the first strips to create a lattice.
Keto pastry is more delicate than wheat pastry, so work gently.
If a strip breaks, simply press it back together.
Trim the edges and gently attach the lattice strips to the bottom crust.
Brush the pastry lightly with the egg wash.
Bake the Pie
Bake at 350°F for approximately 35 to 45 minutes.
The lattice should become golden and the berry filling should be gently bubbling through the openings.
If the crust edges brown too quickly, loosely protect them with foil.
Remove the pie from the oven and place it on a cooling rack.
Don't Skip the Cooling Time!
This step is especially important because we're using beef gelatin to help set the filling.
Allow the pie to cool completely for at least 3 hours.
For cleaner slices, refrigerate the cooled pie for another hour before cutting.
As the pie cools, the berry juices and gelatin develop enough structure to help the filling remain inside the crust rather than running across the plate.
Serve It Your Way
This pie is wonderful served at room temperature or slightly chilled.
Add a dollop of unsweetened whipped cream for a simple dessert.
Or serve a slice with a small scoop of keto vanilla ice cream for an old-fashioned pie-and-ice-cream treat.
A few fresh raspberries or blackberries on the plate would also make a beautiful presentation.
Why Not Just Use All Berries?
You certainly can make a keto-friendly pie using berries alone.
But that's not the purpose of this particular recipe.
We're using zucchini strategically to stretch the berries.
The raspberries, blackberries and blueberries provide authentic berry flavor, natural color and tartness. The zucchini provides additional volume while contributing much less natural fruit sugar.
The exact carbohydrate and sugar reduction will depend on the berries, zucchini, sweetener and quantities used, so I wouldn't promise that every version cuts the carbohydrates exactly in half.
But replacing a substantial portion of an all-berry filling with zucchini can meaningfully reduce the amount of carbohydrates and natural fruit sugars coming from the fruit.
And you're still eating real berries!
A Different Kind of Mock Pie
Our Keto Mock Apple Pie asks zucchini to imitate apples.
This recipe does something slightly different.
We're not asking zucchini to taste like a raspberry, blackberry or blueberry.
We're letting real berries provide those flavors while zucchini quietly stretches the filling.
That's an important difference.
Every forkful can still contain real berries and their juices, but we don't need several cups of fruit to fill one pie.
Estimated Nutrition
The exact nutrition will vary considerably according to the brands of almond flour, sweetener, butter and other ingredients used.
Based on approximately 8 slices:
Calories: approximately 380–400 per slice
Total Fat: approximately 33–35 g
Protein: approximately 10–11 g
Total Carbohydrates: approximately 15–17 g
Dietary Fiber: approximately 7–8 g
Net Carbohydrates: approximately 8–9 g
Sugar: approximately 4–5 g
These are estimates rather than laboratory-tested nutritional values.
Two Mock Pies, Two Completely Different Flavors
Now we have two very different ways to transform zucchini into dessert.
The Keto Mock Apple Pie is warm and cozy with cinnamon, nutmeg and that classic apple-pie character.
The Keto Mock Mixed Berry Pie is brighter and fruitier, with real raspberry, blackberry and blueberry flavor.
Both use zucchini to help reduce the amount of higher-carbohydrate fruit needed to create a generously filled pie.
And both have something I especially love in a homemade pie—a bottom crust and a beautiful golden lattice top.
Sometimes eating keto isn't about giving something up.
It's about figuring out another way to make it.
Love This Mock Pie? Try Another!
If you enjoyed discovering how zucchini can help create this colorful Keto Mock Mixed Berry Pie, don't stop here!
Try my Keto Mock Apple Pie with Zucchini and Lattice Crust next. It transforms zucchini into tender mock apple slices flavored with cinnamon and warm spices, all tucked inside a buttery keto bottom crust and finished with a beautiful lattice top.
One humble vegetable. Two completely different pies!
Explore more Keto Mock Recipes on Blissfully Keto and discover creative ways to enjoy familiar comfort foods with fewer carbohydrates.




