1 lb (450 g) ground beef (80 / 20) 4 oz (115 g) blue cheese crumbles, divided 1 large onion, thinly sliced 1 tbsp (15 ml) butter 1 tsp (5 ml) oil 1 tsp (5 ml) Worcestershire sauce 1 tsp salt 1 / 2 tsp black pepper 4 buns Arugula or baby spinach, to taste (optional)
1. Cook sliced onion in butter and oil over medium-low heat, stirring occasionally, until deep golden and sweet, about 25–30 minutes; set aside and cool. 2. Mix Worcestershire into the beef, divide into 8 patties, and season. 3. Place a spoonful of caramelized onions and about 1 oz blue cheese on 4 patties; top with remaining patties and seal edges tightly. 4. Chill 15–20 minutes to help sealing. 5. Cook on medium-high heat 3–4 minutes per side until crusted and internal temp reaches 160°F (71°C). 6. Let rest briefly, toast buns if desired, top with fresh greens, and serve. ---
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