Cajun Style Pasta

12 ounces linguine
1 teaspoon butter or olive oil
2 garlic cloves, minced
8−12 medium size shrimp, peeled and deveined
1/2 pound chicken breast meat, diced
2 1/2 tablespoons all−purpose flour
2 cups of 1% milk
2 tablespoons sherry
1/4 cup grated Parmesan cheese
1/4 teaspoon cayenne
4 plum tomatoes, seeded and chopped
1/2 cup frozen peas
Salt and black pepper to taste