Korean Kebabs

Ingredients

• 1/4 cup vegetable oil
• 1/4 cup soy sauce
• 1 tablespoon peanut butter
• 2 tablespoons finely chopped spring onion
• 1 teaspoon sesame seeds
• 1 clove garlic, crushed
• 1/8 teaspoon red chile powder, or to taste
• salt and freshly ground black pepper to taste
• 1 1/2 pounds pork tenderloin, cut into cubes
• 1 onion, cut into chunks, or to taste
• 1 (8 ounce) package fresh mushrooms, or to taste
• 1 large red bell pepper, cut into chunks, or to taste
• 1 zucchini, cut into chunks, or to taste