INGREDIENTS
•
1/3 cup vegetable oil
•
1/2 cup soy sauce
•
1/4 cup lemon juice
•
1 tablespoon prepared mustard
•
1 tablespoon Worcestershire sauce
•
1 clove garlic, minced
•
1 teaspoon coarsely cracked black pepper
•
1 1/2 teaspoons salt
•
1 1/2 pounds lean beef, cut into 1-inch cubes
•
16 mushroom caps
•
8 metal skewers, or as needed
•
2 green bell peppers, cut into chunks
•
1 red bell pepper, cut into chunks
•
1 large onion, cut into large squares