For marinade, combine oil, lemon juice, water, brown mustard, honey, oregano and pepper. Add steak, green bell pepper, onion and mushrooms. Toss to coat with marinade.
On 8-inch-long skewers, thread steak, green bell pepper, onion and mushrooms.
Broil 3 to 4-inches from heat for 9 to 12 minutes or until desired doneness, turning and brushing occasionally with marinade.
Servings: 4