Ingredients
Marinade
- ⅓ cup Colman’s mustard
- 2 tablespoons soy sauce
- 2 tablespoons Worcestershire sauce
- ¼ cup olive oil
- 1 teaspoon black pepper (or to taste)
- ½ teaspoon Kosher salt (or to taste)
- 4 cloves garlic (minced)
Main Ingredients
- 1½ to 2 pounds flank steak (trimmed and cut into 1-inch chunks)
- 3 bell peppers (red, yellow, orange and/or green) (cut into 1-inch pieces)
- 2 large red onions (cut into 1-inch pieces)
- 8 to 10 wood or metal skewers
- Vegetable oil (for grill grates)
Instructions
- Prepare the Marinade: Place all the marinade ingredients, including Colman’s mustard, soy sauce, Worcestershire sauce, olive oil, black pepper, Kosher salt, and minced garlic, into a small bowl. Whisk them together thoroughly until the mixture is well combined.
- Marinate the Steak: Place the steak chunks into a large resealable plastic bag and pour in the marinade. Press out excess air, seal the bag, and massage the steak around to ensure each piece is evenly coated. Refrigerate for a minimum of 2 hours, or up to 24 hours for deeper flavor infusion.
- Preheat the Grill: Light your gas or charcoal grill and bring it to a high heat. Once hot, clean the grill grates thoroughly and brush them lightly with vegetable oil to prevent sticking.
- Assemble the Kabobs: While the grill is heating, thread the marinated steak pieces onto the skewers, alternating with cut bell pepper pieces and red onion chunks. Leave a small gap between each piece to ensure even cooking. Brush the vegetables lightly with some of the remaining marinade to enhance flavor.
- Grill the Kabobs: Place the assembled kabobs perpendicular to the grill grates. Cook over medium-high heat for about 3 to 4 minutes on each side, turning carefully to char the veggies slightly and cook the steak to medium-rare (about 125ºF internal temperature).
- Rest and Serve: Remove the kabobs from the grill and let them rest for 5 minutes before serving. This resting period allows the juices to redistribute, ensuring tender and juicy steak.
Notes
- For more well-done steak, extend grilling time by 2-3 minutes per side, but beware of overcooking.
- Soak wooden skewers in water for at least 30 minutes before using to prevent burning on the grill.
- Marinate up to 24 hours ahead to maximize flavor, but avoid extending beyond 24 hours to prevent texture degradation.
- Vegetables can be substituted with mushrooms or zucchini as desired.
- Letting kabobs rest after grilling is essential for juicy results.
- Use a meat thermometer to accurately check steak doneness.
- Prep Time: 15 minutes
- Cook Time: 12 minutes
- Category: Main Course
- Method: Grilling
- Cuisine: American