1 cup mayonnaise
⅓ cup sour cream
1 large clove garlic, pressed
2 tablespoons lemon juice
2 anchovies, finely minced
1 teaspoon Worcestershire sauce
1 pound penne pasta, cooked until al dente and rinsed with cool water
6 large leaves Romaine lettuce, thinly sliced
1½ cups grape tomatoes
4 green onions. green parts sliced
½ cup finely shredded Parmesan cheese
½ teaspoon ground black pepper
2 grilled chicken breasts, diced
1½ cups croutons