Supreme Pizza Pasta Salad

Name: Supreme Pizza Pasta Salad
Ingredients: 2 plum tomatoes, seeded and chopped; 1/2 red onion, chopped; 8 fresh, white button mushrooms, sliced; 1 small green bell pepper, seeded and chopped; 20 leaves fresh basil, torn; 1 lbs wagon wheel pasta; 1 pepperoni stick, casting removed and diced; 1 lbs ball fresh mozzarella; 1 teaspoon dried oregano; 1 teaspoon garlic salt; 1 rounded tablespoon tomato paste; 2 tablespoons red wine vinegar; 1/3 cup extra virgin olive oil; Ground pepper to taste