Mom’s Beef Shish Kabobs

Mom’s Beef Shish Kabobs
Ingredients:

½ cup soy sauce
⅓ cup vegetable oil
¼ cup lemon juice
1 clove garlic, minced
1 tablespoon prepared mustard
1 tablespoon Worcestershire sauce
1 ½ teaspoons salt
1 teaspoon coarsely cracked black pepper
1 ½ 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

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