1/2 cup butter
1/2 cup all-purpose flour
1 1/2 teaspoons baking powder
1 2/3 cups milk
1/3 cup crushed pineapple
1/4 cup lemon juice
1 egg
1 cup white sugar
1/2 teaspoon vanilla extract
Preheat the oven to 450 degrees F (220 degrees C). Grease two 8 inch square pans. Divide the butter and flour into two cups of prepared pan mixture. In a separate bowl, stir together lemon juice, egg, sugar, vanilla and pineapple. Mix well. Pour mixture into prepared pan.
Bake in preheated oven for 45 minutes. Cool completely. Chill Frost with a wooden spoon or with waxed paper. Refrigerate several hours or overnight. Cut into cubes.