I too am looking for a recipe for pickled red onions that is similar to bread and butter pickles. I love the onions found in the bread and butter pickles of a local pickle manufacturer. I want to do just the onions.
1cup cider vinegar
Up to 3 Tbs. brown sugar
1 tsp. salt
1 tsp. whole peppercorns
4 medium red onions, very thinly sliced
First, fill a teakettle with water and put it on to boil. Meanwhile, combine vinegar, 1 cup water. sugar, salt and peppercorns in a medium-sized bowl and stir until the sugar is dissolved.
Place the sliced onions in a colander in the sink and slowly pour boiling water over them. They will wilt slightly. Drain well and transfer to the bowl of marinade.
Cover and allow to marinate, refrigerated or at room temperature, for at least several hours. Store in the refrigerator (they keep practically forever) and use as needed. These are great with any bean salad, with sandwiches, in an antipasto, or on pizza.
Moosewood Cookbook, Revised Edition by Mollie Katzen