In a large bowl, combine the berries. Mix together sugar the 2/3 cup of sugar, tapioca and lemon zest; sprinkle over berries and toss gently. Pour into a greased 11×7-inch or equivalent. baking dish; let stand for 15 minutes.
Meanwhile, make the topping, in a small bowl, combine the flour, oats, sugar, and butter. Sprinkle over berry mixture when the 15 minutes is up.
Bake at 350° until filling is bubbly and topping is golden brown, 45-50 minutes. Serve warm and, if desired, with vanilla ice cream or sweetened whipped cream.
Notes:
- Strawberries are specifically called for to add some bulk; without them, using only small berries, the berry portion will be very thin.
- A mixture of strawberries, raspberries, blueberries and blackberries is particularly delicious
- If using frozen blueberries, use without thawing to avoid discoloring the topping; may need to bake a little longer.
Nutrition:
1 piece, without whipped or ice cream: 290 calories, 8g fat (5g saturated fat), 20mg cholesterol, 84mg sodium, 54g carbohydrate (36g sugars, 4g fiber), 2g protein.