Buffalo Burger with Bourbon Glazed Onions

Buffalo Burgers

• 6 - 8 fresh sage leaves
• 2 ½ oz shallots
• 1 garlic clove
• 1 tsp mustard powder
• ⅛ tsp freshly ground black pepper
• 16 oz ground buffalo meat

Bourbon Glazed Onions

• 18 oz red onions, quartered
• ½ oz olive oil
• ½ oz unsalted butter
• 2 oz dark brown sugar
• ¼ tsp salt, plus extra to taste
• ¼ tsp ground black pepper, plus extra to taste
• 2 oz bourbon

Cooking Burgers and Assembly

• salt, to taste
• 4 hamburger buns, toasted
• ketchup, to taste
• 4 slices cheddar cheese
  sau 4 slices Swiss cheese
• 4 oz Roma tomatoes, sliced
• 4 - 8 pieces butter lettuce