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A close-up of Korean Steak Sandwich on a serving board placed on white marble kitchen counter.

Easy Korean Steak Sandwich

A savory fusion sandwich featuring tender flank steak marinated in sweet soy and garlic, topped with spicy peppers and garlic mayo in a toasted baguette.
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Prep Time 15 minutes
Cook Time 10 minutes
Marinade Time 30 minutes
Total Time 55 minutes
Servings: 4 people
Course: Dinner
Cuisine: Korean
Calories: 580
Ingredients Equipment Method Notes

Ingredients
  

  • 1.5 pounds flank steak Sliced thin for quick cooking
  • 0.3 cup soy sauce Creates savory umami base
  • 2 tablespoons brown sugar Caramelizes in the skillet
  • 4 cloves fresh garlic Minced fine for aroma
  • 1 large French baguette Crispy crust and soft center
  • 0.5 cup mayonnaise Blended for creamy spread

Equipment

  • 1 Cast iron skillet For high-heat searing
  • 1 Mixing bowl For blending marinade
  • 1 Chef Knife For slicing steak and bread

Method
 

  1. Whisk soy sauce, brown sugar, and minced garlic together in a bowl.
  2. Submerge thin flank steak strips inside the savory marinade liquid.
  3. Heat a cast iron skillet over high heat until completely shimmering.
  4. Place marinated steak strips in a flat single layer and sear.
  5. Slice the French baguette open down the center length.
  6. Spread garlic mayonnaise generously across both inner bread faces.
  7. Pile the sizzling hot bulgogi steak slices high onto the mayo base.
  8. Scatter fresh sliced jalapeños and red onions over the meat before serving.

Notes

Slice the cooked flank steak thinly across the grain to ensure the meat is tender and easy to bite through in the sandwich.