Ingredients
- 2 medium red onions, halved and thinly sliced
- 1 1/2 cups dry red wine
- 1 teaspoon honey
- 1/2 cup raisons
- 2 teaspoons finely chopped fresh thyme leaves
- 1 tablespoon red wine vinegar
- kosher salt and freshly ground black pepper
- 2 ounces roquefort cheese, softened, plus a bit more for topping the burger
- 4 tablespoons unsalted butter, at room temperature
- 1 1/2 pounds ground sirloin
- 3 tablespoons olive oil, separated
- 4 kaiser rolls, split
- 4 ounces arugula
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