Lamb Sliders with Red Onion Marmalade

Name: Lamb Sliders with Red Onion Marmalade
Ingredients: 3 cups red onion, thinly sliced; ½ cup brown sugar; 1 cup red wine (anything in the house is fine); ½ cup sherry vinegar; ½ cup red wine vinegar; 1 bay leaf; 2 pounds ground lamb; 4 tablespoons fresh oregano, finely chopped; 2 teaspoons red chili flakes; 4 teaspoons fennel seed, toasted and ground; 4 tablespoons roasted red pepper, small dice (preferably done at home, but from a jar is OK); Kosher salt, for seasoning; Freshly ground black pepper, for seasoning; 10-12 mini brioche slider buns (if not, dinner rolls will do), buttered and lightly toasted; ½ pound Roquefort cheese