He used fresh strawberries, blueberries, and some of our frozen boysenberries. Our boysenberries tend to be pretty tart, so with the 3 tablespoons of sugar, the crumble ended up rather tart. Perfect for my dad and me, but my mother complained (“why can’t you make it the way I like it? Why do you always have to make things like this so tart?”) Mom knows she’s welcome to bake anything she wants the way she likes it, so this conversation didn’t go very far. But check your berries if and when you make this recipe. Add more or less sugar depending on your preference and how sweet the fruit is. Instant tapioca is needed as a thickener. You can make this without it, but it will be quite runny. If you don’t have instant tapioca, you can try substituting corn starch. Let cool at least half an hour. Serve warm.
