3bell peppers (I use orange, red and yellow), cut into bite sized pieces
Salt and ground black pepper
Steak kabob marinade:
Place olive oil, soy sauce, vinegar, lemon juice, brown sugar, garlic, salt, and pepper in a large bowl or gallon-sized zip-top bag. Stir or shake until combined. Place meat inside the bag and let sit for at least 30 minutes (up to 5 hours). If you have more time, let it sit longer.
Preheat the grill to medium-high heat and close the lid.
Thread meat and vegetables through skewers. Place the skewers on preheated grill. Turn the skewers until nicely browned on all sides and the meat is no longer pink, about 10 to 15 minutes. Season with salt and pepper before serving, if desired.