Creamy cheese tortellini Caesar salad

1/2 450-g pkg fresh or frozen cheese tortellini pasta, about 2 1/2 cups

1 small anchovy, or 3/4 tsp anchovy paste

2 garlic cloves, minced

3 tbsp up to 4 tbsp freshly squeezed lemon juice

2 tsp Dijon mustard

1/4 tsp hot pepper sauce

1/4 tsp salt

1/4 tsp freshly ground black pepper

1/3 cup olive oil

1 large head romaine lettuce, torn into bite-size pieces

2 tbsp freshly grated parmesan

1 cup croutons, optional