Flour for dusting
Peanut oil, for deep-frying

In 1 bowl, mix together flour, salt and baking powder.

In another bowl, beat egg yolk, then stir in milk and vegetable oil. Combine wet and dry ingredients, stir until smooth.

In a third bowl, beat egg white until soft peaks form, then fold into egg-flour mixture, stirring until smooth.

Dust rings in flour and thoroughly remove excess. Dip onion rings into batter and deep fry.