Ingredients
- 6 oz. cremini mushrooms, thinly sliced
- 1 red onion, thinly sliced into rings
- 1 cup red wine vinegar
- 1⁄2 cup olive oil
- 1 tsp. dried basil
- 1 tsp. dried oregano
- Kosher salt, to taste
- Freshly ground black pepper, to taste, plus 1 tbsp.
- 2 lb. ground beef
- 4 oz. blue cheese
- 2 tbsp. dehydrated garlic flakes
- 1 tbsp. coriander seeds
- 1⁄2 tbsp. dill seed
- 1⁄2 tsp. crushed red chile flakes
- 1⁄2 tbsp. dried onion flakes
- 4 hamburger buns, toasted
- Dijon mustard, for serving
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