Prep time: 25-30 minutes Cook time: 4-5 minutes per batch Materials: 2 cups flour sifted  7 egg yolks 1 egg white 4 tbsp. powdered sugar 3 tbsp. margarine or unsalted butter ⅓ cup sour cream Pinch of salt 1 tbsp vodka or vinegar Powdered sugar for dusting  Jam (optional) Vegetable oil for frying Process: On…