Ingredients
- 1 1/2 pounds boneless sirloin steak
- Kosher salt and freshly ground pepper
- 1 tablespoon extra-virgin olive oil
- 1 tablespoon unsalted butter
- 2 sweet onions, sliced
- 1 tablespoon fresh thyme
- 1/3 cup low-sodium chicken broth
- 4 sub rolls, split
- 2 cups shredded gruyere cheese (about 6 ounces)
- 1 pint pickled or marinated vegetables (from the deli counter)
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