Belgium Waffles

1 pkg. dy yeast
2 c. lukewarm milk
4 eggs, seaparated
1 tsp vanilla
2 1/2 c flour
1/2 tsp salt
1 tbsp sugar
1/2 c. melted butter

Sprinkle yeast over warm milk; stir to dissolve. Beat egg yolks and
add to yeast mixture with vanilla. Sift together flour, salt and
sugar; add to the liquid ingredients. Stir in melted butter and
combine thoroughly. Beat the egg whites until stiff; carefully fold
into batter. Let mixture stand in a warm place about 45 minutes or
until it doubles in bulk. Heat waffle iron. Bake as directed.