Ingredients
- 1 garlic clove
- 1 bay leaf
- 1½ tsp. black peppercorns
- ¾ tsp. crushed red pepper flakes
- ½ cup white balsamic vinegar or white wine vinegar
- ¼ cup sugar
- 1 medium red onion, thinly sliced
- 1 large egg yolk*
- 2 Tbsp. spicy brown mustard
- 1 Tbsp. Worcestershire sauce
- 1½ tsp. apple cider vinegar
- 1½ tsp. honey
- 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more
- 1 tsp. freshly ground black pepper, plus more
- ½ cup vegetable oil
- 2 tsp. (or more) plus 2 Tbsp. ghee or clarified butter
- 8 slices white sandwich bread
- 1 lb. ground beef
- 4 slices white cheddar
- 4 large eggs
- Tender lettuce leaves (for serving)
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