Bison Burger with Cheddar and Pickled Onions

Bison Burgers

• 600 g bison, freshly ground (see Tip)
  hoặc 600 g ground bison, store bought
• 8 g garlic cloves, peeled (approx. 2 large)
• 75 g onions, in pieces
• 1 egg
• 75 g beer, golden Canadian beer or ale (see Tip)
• 1 ½ tsp Worcestershire sauce
• ½ tsp onion powder
• ½ tsp garlic powder
• ½ tsp dried red chili flakes
• 1 tsp salt
• freshly ground black pepper, to taste
• 135 g strong cheddar cheese, cut into 3 cubes

Grilled Picked Onions

• 150 g red onions, peeled and trimmed
• 120 g apple cider vinegar
• 60 g sugar
• 1 tsp salt
• olive oil, to grease
• 3 burger buns, toasted, to serve