Butter an 8 x 8″ or 9 x 9″ pan then add the following in order:
2 cups blueberries
Juice of 1/2 lemon
1/2 tablespoon cinnamon
Mix batter: 3/4 cups sugar, 3 tablespoon margarine, 1 cup of flour, 1 teaspoon salt, and 1/2 cup of milk. Spread over blueberries.
Mix topping: 1 cup sugar, 1 tablespoon cornstarch, dash of salt, and 1 cup boiling water. Pour over batter.
Bake one hour at 375. This is delicious served warm and topped with ice cream.