Preparation - Measure the water into a large bowl. Dissolve 1 tsp. sugar in the water. Sprinkle the yeast over the water and let stand for 10 minutes. Stir, then add all the remaining ingredients except the egg whites. Whisk or beat at low speed with an electric mixer until smooth. Cover with a cloth and let rise in a warm place for 30 minutes. Beat the egg whites until stiff, but not dry. Fold into the batter. (This step is very important for light & fluffy waffles.) Bake in a moderately hot waffle iron. Makes 5 large waffles.