Guinness-battered Onion Rings

Description
A great appetizer to start off an Irish meal.
 * Makes 4 servings.

Ingredients

 * 4 cups vegetable oil, for frying
 * 2 cups flour
 * ¼ teaspoon cayenne pepper
 * 1 teaspoon baking powder
 * 2 teaspoons cornstarch
 * ½ teaspoon salt, plus more for seasoning
 * ½ teaspoon ground white pepper
 * 1 (12-ounce) bottle Guinness, at room temperature
 * 1 large yellow onion, peeled and cut into ½-inch thick rings

Directions

 * 1) Preheat oil to 360 °F in a deep stockpot or deep-fryer.
 * 2) Combine flour, cayenne pepper, baking powder, cornstarch, salt and white pepper in a bowl.
 * 3) Whisk in Guinness until you get a smooth batter.
 * 4) Place onion rings in Guinness batter and coat well.
 * 5) Then transfer to the deep fryer and fry for 1–2 minutes or until the batter is golden brown.
 * 6) Remove excess oil by placing onion rings on absorbent paper.
 * 7) Season with salt before serving.