Amish Onion Fritters with Chive Dip

2 large onions, thinly sliced
1 cup all-purpose flour
1 teaspoon baking powder
1 teaspoon salt
1/2 teaspoon black pepper
1 egg, beaten
1/2 cup milk
Oil for frying
For the chive dip:
1 cup sour cream
1/4 cup finely chopped chives
1 tablespoon lemon juice
Salt and pepper, to taste