• 1 & 1/2 pounds beef sirloin, cut into 1-inch cubes
• 1 red onion, chopped
• 1 green bell pepper, chopped
• 1 red bell pepper, chopped
• 4 ounces mushrooms
• 1 large zucchini, sliced

Marinade:

• 1 cup coconut aminos or low-sodium soy sauce
• 1/2 cup oil
• 2 tablespoons balsamic or red wine vinegar
• 2 tablespoons lemon juice
• 1 tablespoons Dijon mustard
• 2 garlic cloves, minced
• 1 teaspoon dried oregano
• 1 teaspoon dried basil
• 1/2 teaspoon pepper