1 pound medium shrimp, cooked and peeled  | 
                                                4 cups cooked medium seashell pasta (about 2 cups uncooked pasta)  | 
                                                2 cups chopped plum tomatoes (about 1 pound)  | 
                                                1/2 cup chopped green bell pepper  | 
                                                1/3 cup fresh lemon juice  | 
                                                1/4 cup chopped shallots  | 
                                                1/4 cup chopped fresh or 4 teaspoons dried basil  | 
                                                2 tablespoons extra-virgin olive oil  | 
                                                1/2 teaspoon salt  | 
                                                1/2 teaspoon black pepper  | 
                                                1 garlic clove, minced  |