Onion Ring Beer Batter
1/2 cup seltzer water or club soda
1 tablespoon oil
1 egg white
1/2 teaspoon cayenne pepper
1 teaspoon kosher or sea salt
1 cup Wondra or pastry flour
1/4 teaspoon mustard powder
1/2 teaspoon onion powder
Slice large sweet onions into rings. Separate rings. Soak in a small amount of milk for 10 minutes. D rain and lightly sprinkle with onion powder, then dip in batter.
Fry small batches in hot oil (365F), turning once, gently to brown evenly. Remove using a slotted spoon and drain on paper towels before serving. Season with salt and pepper (a little hot salt or cayenne, if desired) while still hot from fryer.
Serve in paper baskets lined with paper towels. Great with batter-fried fish.