Start to finish: 30 minutes Servings: 16 1 tablespoon olive oil 2 large sweet onions, diced 1 cup cold Guinness 1/2 teaspoon salt 1/2 teaspoon ground black pepper 1/4 teaspoon cayenne 1 pound extra-sharp cheddar cheese (preferably Irish), cubed Crackers, chips or bread, to serve In a large skillet over medium, heat the olive oil. Add the onions and cook, stirring occasionally, until browned and caramelized, about 20 minutes. If the onions begin to char before they caramelize, add a tablespoon or 2 of water.