For the pancakes, mix the pumpkin purée, egg yolk, milk and sugar in a bowl until smooth. Mix the flour, baking powder and spices together in a separate bowl and add a pinch of salt, then whisk these dry ingredients into the pumpkin mixture. In another bowl, whisk the egg white until stiff. Carefully fold it
into the pancake batter, mixing lightly but thoroughly until no streaks of egg white remain.