Juicy strips of flank steak, caramelized onions, and mushrooms are sandwiched between a layer of horseradish mayo and two golden pieces of baguette. This meaty sandwich was a huge hit in our household, and since it’s made almost entirely on the grill it’s perfect for busy weeknights, tailgating, or cookouts.
Grilled Flank Steak Sandwiches with Caramelized Onions and Mushrooms
For the steak and marinade:
1.5-2 pounds flank steak
1/4 cup olive oil
3 cloves garlic
2 tablespoons red wine vinegar
1/3 cup soy sauce
2 tablespoons honey
1/2 teaspoon ground pepper
For the mushrooms and onions:
1 tablespoon butter
2 tablespoons olive oil, divided
1 large yellow onion, thinly sliced
8 ounces sliced mushrooms
For the sandwiches:
1 large french baguette, cut into fourths (or two smaller ones cut in half)
8 slices white cheddar cheese
1/4 cup mayo
1/4 cup sour cream
2 tablespoons creamed horseradish spread
For more options to meet your weeknight dinner schedule, check out this week’s #WeekdaySupper menu.
We are partnering with The Beef Checkoff to present simple beef meals. For even more inspiration, follow the Beef Pinterest board. You can connect with The Beef Checkoff on Twitter, Facebook, and Pinterest.