1 cup mayonnaise
1/3 cup sour cream
1 clove large 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 leaves large Romaine lettuce thinly sliced
1 1/2 cups grape tomatoes
4 green onions. green parts sliced
1/2 cup finely shredded Parmesan cheese
1/2 teaspoon ground black pepper
2 grilled chicken breasts diced
1 1/2 cups croutons