Sweet and Sour Cipollini Onions Recipe

Bring a large pot of water to a boil. Add onions and simmer until tender about 20 minutes. Drain and pat dry.

Melt butter in a large skillet over medium-high heat. Add onions and stir until well coated with butter. Season with salt. Cook and stir until onions are brown and caramelized about 5 minutes. Pour in vinegar and sprinkle with sugar. Continue cooking and stirring until vinegar comes to a boil. Boil until vinegar thickens and glazes onions about 5 minutes. Serve hot or cooled with vinegar syrup drizzled on top.