German Pineapple Kasekuchen ( Cheesecake)

Ingredients

• 2/3 cup cold butter
• 2/3 cup sifted confectioners sugar
• 2 cups sifted all-purpose flour
• 3/4 tsp salt
• 1/2 tsp baking powder
• 1 small egg, lightly beaten
• 1 Tbsp milk
• 1 can crushed pineapple in its own juice, very well drained
• 3 eggs, separated
• 1 cup granulated sugar
• 2 tsp vanilla
• 3/4 cup well-softened butter
• 3/4 cup heavy cream
• 3 cups quark ( a soft, unaged fresh cheese, see story above for sources)
• 1/2 tsp salt
• 2 Tbsp sifted flour