SERVES 8
Preheat oven to 350 degrees.
Put all topping ingredients in a bowl and rub together with your hands until small clumps are formed.
Pour berries into a 9 X 13-inch baking dish. Squeeze lemon juice over berries, sprinkle with sugar and flour. Toss to evenly coat berries.
Scatter topping over berries in an even layer. Bake for approximately 45 to 50 minutes, or until topping is golden brown and berry juice bubbles up through topping.
Serve with vanilla ice cream if desired!