Ingredients
- One 2-pound piece flank steak
- 2 cups low-sodium beef broth
- 1/4 cup Worcestershire sauce
- 2 tablespoons tomato paste
- 2 tablespoons balsamic vinegar
- 4 sprigs fresh thyme plus 1/2 teaspoon leaves, finely chopped
- 2 cloves garlic, smashed
- Kosher salt and freshly ground black pepper
- 2 tablespoons unsalted butter
- 1 small red onion, thinly sliced (about 1 cup)
- 2 teaspoons all-purpose flour
- 4 soft hoagie buns, lightly toasted
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