Cantonese Sweet-and-Sour Pork

Ingredients

• 1 can (15 ounces) tomato sauce
• 1 medium onion, halved and sliced
• 1 medium green pepper, cut into strips
• 1 can (4-1/2 ounces) sliced mushrooms, drained
• 3 tablespoons brown sugar
• 4-1/2 teaspoons white vinegar
• 2 teaspoons steak sauce
• 1 teaspoon salt
• 1-1/2 pounds pork tenderloin, cut into 1-inch cubes
• 1 tablespoon olive oil
• 1 can (8 ounces) unsweetened pineapple chunks, drained
• Hot cooked rice