my mother's date pocket cookies

Ingredients

• 6 cups all purpose flour
• 1/2 cup granulated sugar
• 6 large eggs, separated (3 whole & reserve 3 whites)
• 1/2 pound oleo (butter or margarine)
• 1 cup lard (solid crisco shortening)
• 4 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 pint dairy sour cream
• FILLING:
• 4 cups dates, pitted and cut fine
• 1 1/2 cups granulated sugar
• 1 1/2 cups boiling water
• 2 teaspoons lemon juice
• 2 teaspoons butter
• 1/2 pound chopped nuts