| Ingredients: | Quantity |
| Ground beef (80/20 blend) | 2 lbs |
| Sweet onions, thinly sliced | 3 large |
| Olive oil | 2 tablespoons |
| Garlic, minced | 4 cloves |
| Worcestershire sauce | 2 tablespoons |
| Beef broth | 1 cup |
| Eggs, large | 2 |
| Panko breadcrumbs | 1 cup |
| Fresh thyme, chopped | 1 tablespoon |
| Salt | 1 ½ teaspoons |
| Ground black pepper | 1 teaspoon |
| Dijon mustard | 2 teaspoons |
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