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Ingredients

• 1 1/2 pounds ground sirloin
  
• 2 tablespoons canola oil
  
• Kosher salt and freshly ground black pepper
  
• 4 ounces blue cheese, cut into 4 slices
  
• 6 tablespoons unsalted butter, softened
  
• 4 hamburger buns or kaiser rolls, split
  
• 3 tablespoons Dijon mustard
  
• 1 cup watercress leaves
  
• Red Wine-Onion Jam (recipe follows)
• 2 tablespoons olive oil
• 2 medium red onions, halved and thinly sliced
• 1 cup red wine
• 2 tablespoons red wine vinegar
• 1 tablespoon honey
• 2 teaspoons finely chopped fresh thyme leaves
• Kosher salt and freshly ground black pepper

Description

Serious Eats