Olive Garden's Shrimp Primavera

Ingredients:
=== SAUCE ===
1/3 ounce butter or margarine
1 package Knorr Romaglio Pasta Sauce Mix - (1 oz) (or similar dry sauce mix)
28 ounces canned tomatoes -- crushed
2 tablespoons lemon juice
1/4 teaspoon crushed red chili pepper
1/2 teaspoon dried basil
1/4 teaspoon dried marjoram
1/2 teaspoon freshly-ground black pepper
=== VEGETABLES ===
2 tablespoons butter
1/2 pound mushrooms -- halved
1 cup green peppers in 1" squares
1 cup red peppers in 1" squares
1/2 cup yellow onion in 1" squares
1 pound fresh or dry linguini -- cooked
1 pound medium to large shrimp -- cooked, peeled, and deveined

Cooking Directions:
Melt butter in 3-quart pan over medium heat. Add remaining sauce ingredients. Stir well and simmer for 10 minutes. In a large saut pan, melt 2 tablespoons butter. Saut vegetables about 3
minutes until crisp-tender. Add to the sauce and simmer 5 more minutes.
When pasta is almost done, stir shrimp into sauce to heat through. Do not boil. Spoon Shrimp Primavera sauce over hot linguini. Sprinkle with Parmesan.
This recipe yields 4 servings.