Ingredients:

1 large sweet onion
1 cup flour
1/2 teaspoon salt
1/4 teaspoon cayenne pepper, optional
2/3 cup water
2 tablespoons vegetable oil
1 egg white, stiffly beaten

Preparation:
Cut onion into rings and cover with ice water. Refrigerate while making the batter. Combine batter ingredients, folding in stiffly beaten egg white last. Drain the chilled onion ring slices, dip in the batter and [...]