Kids will love this for dessert.
Clean and hull strawberries and set aside. In a bowl whip the ricotta with lemon juice, vanilla, crushed walnuts and stevia. Add dollops of the ricotta mixture to the top of each strawberry. Top each strawberry with a blueberry and arrange them in a bowl on their side to look like a star with strawberries on their sides and the blueberries in the center.