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A perfect balance of smoky, tender steak, rich caramelized onions, and creamy horseradish sauce—this French Onion Steak Sandwich is a true indulgence. Whether you’re preparing it for a special dinner or just craving something flavorful and hearty, this recipe will satisfy your taste buds. Melted Swiss cheese, savory steak, and the deep flavor of slow-cooked onions are all sandwiched in a toasted French bun, making each bite irresistible.
Ingredients
For the Creamy Horseradish Sauce:
1/2 cup mayonnaise
1/2 cup sour cream
1 tablespoon prepared horseradish sauce
1 tablespoon Dijon mustard
Juice from 1 lemon
Zest of 1/2 lemon
2 teaspoons fresh rosemary, finely chopped
2 teaspoons fresh chives, finely chopped
1 teaspoon freshly ground black pepper
For the French Onions:
2 large white onions, diced
6 cloves garlic, minced
1 cup beef broth
3 tablespoons dark lager beer
1 tablespoon fresh rosemary, finely chopped
2 teaspoons kosher salt
2 tablespoons beef tallow (or substitute with butter)
1 tablespoon fresh parsley, finely chopped
For the Steak:
Olive oil (for coating)
Binder (optional, such as mustard or oil)
Steak King seasoning (or your preferred steak seasoning)
For Assembling the Sandwiches:
French sub buns
6 slices Swiss cheese (per sandwich)
Hickory wood chunks (for smoking the steaks)
Instructions
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