Grease a 1.5 L baking dish
Prepare apples, measure, and arrange in dish.
Sprinkle with granulated sugar
Combine lemon juice and water. Poor over apples.
Cream butter and gradually add brown sugar.
Blend in flour and oats. Spread over apples.
Bake at 375°F until apples are tender, about 35 minutes.
Serve warm, plain, or with ice cream.