Preparation

• Dissolve the yeast in the warm milk. Place the flour in a large bowl and make a well in the center. Add the milk and yeast mixture, the egg yolks and salt. Mix well together. Cover the bowl and leave to rise at room temperature until doubled in volume.
  Stir in the remaining milk. Beat the egg whites with the cream of tartar until stiff. Fold in the batter mixture.
  Heat a large non stick frying pan over medium heat. Using a teaspoon, spoon enough batter in pan to form small 2-inch round pancakes. Brown on one side, and turn once to cook the other side.
  Transfer to a tray. Cover with foil.