Ingredients
- 1 tablespoon vegetable oil
- 1 yellow onion, cut in half, then thinly sliced (julienne style)
- 1/2 teaspoon chopped fresh thyme
- 32 ounces ground wagyu beef
- 1/4 cup Dijon mustard
- Kosher salt and ground black pepper
- 4 slices Gruyere
- 4 tablespoons butter, optional
- 4 brioche hamburger buns
- 4 leaves green leaf lettuce, trimmed
- 1 tomato, sliced
- Desired condiments, for serving
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