Hungarian Nut-Filled Cookies | La Cucina Grandinetti

Ingredients

• 2 cups granulated sugar
• 4 cups walnuts (finely ground)
• 2 large egg whites (or enough to make a good spreading consistency)
• 6 cups all-purpose flour
• 1 cup granulated sugar
• 1 cup (2 sticks) unsalted butter
• 1/2 cup vegetable shortening
• 1 teaspoon baking soda
• 5 teaspoons baking powder
• 3 large eggs
• 1 cup buttermilk
• 2 tablespoons unsalted butter
• 2 cups powdered sugar, sifted
• 1/4 evaporated milk (or whole milk)