Balsamic Flat Iron Steak Sandwich with Grilled Peaches
This juicy and flavorful Balsamic Flat Iron Steak Sandwich recipe with Grilled Peaches is simple to prepare and perfect for a laid-back dinner on the grill.
Prep Time20 minutesmins
Cook Time15 minutesmins
Meat resting pre-cook8 hourshrs
Total Time8 hourshrs35 minutesmins
Course: Main Course
Cuisine: American
Keyword: balsamic flat iron steak, grilled flat iron steak, steak sandwich recipe, steak wtih peaches
Servings: 6sandwiches
Calories: 224kcal
Author: Whitney Reist | Sweet Cayenne
Equipment
Grill
Cast Iron Skillet
Ingredients
For the steak:
1.5poundsflat iron steak
Kosher salt
¼cupolive oil
¼cupbalsamic vinegar
2tablespoonshoney
1tablespoonfresh thyme, finely chopped
1tablespoondijon mustard
1tablespoonminced garlic
½teaspoonpepper
For the peaches:
3largepeaches, sliced into ¼’’ rounds
¼cupbalsamic vinegar
2tablespoonshoney
2tablespoonssalted butter
1teaspoonfresh thyme, finely chopped
½teaspooncoarse black pepper
¼teaspoonKosher salt
Pinchred pepper flakes
Burger assembly:
Thin slices of havarti cheese, about 12 total
Buns
Fresh basil leaves (optional)
Arugula
Instructions
The night before:
Place the steak on a wire cooling rack fitted inside of a baking pan. Season the steak on all sides with Kosher salt. Place in the fridge to age, uncovered, for a minimum of 8 hours and up to 24 hours.
The day of:
Combine the ingredients for the marinade in a small bowl: olive oil, balsamic vinegar, honey, thyme, Dijon, garlic, and pepper. Pour over the steak. Let marinate for 2 hours.
Preheat a grill to medium-high heat (425°F). While the grill heats, prepare the balsamic sauce for the peaches.
In a small saucepan, combine the balsamic vinegar, honey, butter, thyme, pepper, salt, and red pepper flakes. Bring to a boil over medium heat. Reduce heat to medium-low and simmer vigorously (not a full boil), stirring often, for 4 minutes. Remove from heat.
Once the grill is heated, remove the steak from the marinade. Grill for 4-5 minutes on each side or until the internal temperature is 125°F for medium-rare, 135°F for medium, or 145°F for well-done. Let the steak rest for 10 minutes before slicing against the grain into thin strips.
While the steak rests, grill the peaches for 2 minutes. Flip and grill for 2 minutes more after brushing the balsamic glaze on the side with grill marks. Remove from grill and transfer to a serving plate.
Serve the thinly-sliced steak on a toasted burger bun topped with thinly-sliced havarti, grilled peaches, extra balsamic sauce, fresh basil, and arugula. Enjoy!