Ingredients
- 3 1/2 tablespoons unsalted butter
- 1 large onion, thinly sliced
- Kosher salt
- 1 1/2 cups low-sodium beef broth
- 1/4 teaspoon freshly grated nutmeg
- 1 tablespoon horseradish, plus more to taste
- 8 ounces gruyere cheese, thinly sliced
- 3/4 pound thinly sliced roast beef
- 4 hoagie rolls, split
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