Preheat oven to 350°F and line an 8x8” square pan with parchment paper. Grease with nonstick cooking spray.
In a mixing bowl, stir together the almond flour, tapioca flour, coconut sugar, salt, and melted coconut oil until fully combined, and there's no dry flour remaining. Press the crust evenly in the pan.
1 cup (96g) blanched almond flour, 2 tablespoons tapioca flour, 2 tablespoons coconut sugar, ⅛ teaspoon salt, 2 tablespoons coconut oil
In your food processor or blender, grind the almonds, tapioca flour, salt, and coconut sugar to a powder (or as fine as you can make it). Add the coconut oil and process until no longer visible. Add the egg and vanilla, blending until completely incorporated, and a smooth paste is formed. Spread the filling evenly over the almond crust.
¾ cup (110g) unsalted raw almonds, 1 tablespoon tapioca flour, ¼ teaspoon kosher salt, ⅓ cup coconut sugar, 5 tablespoons (70g) coconut oil, 1 large egg, 1 teaspoon vanilla
Toss the fruit with the lemon zest and juice, and evenly spread over the almond paste.
1 cup chopped rhubarb, 1 cup fresh raspberries, 1 teaspoon lemon zest, 1 tablespoon lemon juice
Bake for 40 minutes, or until set and a skewer inserted into the center comes out clean.
Let cool completely before cutting into squares.
Keep any leftovers in the fridge in an airtight container.