Put the vinegar, lemon juice, garlic, egg yolk, mustard, Worcestershire sauce, anchovies, and pepper in a blender and blend until well mixed. With the machine running, add the olive oil, at first by drops and then, as the mixture emulsifies, in a thin, steady stream until all the oil is incorporated. Pulse in the Gorgonzola to taste (the riper the cheese, the less you will need) and the Parmesan. Scrape into a bowl, cover, and refrigerate until needed. You should have about 1 1/3 cups. (The dressing keeps, refrigerated, for 2 to 3 days.) Put the lettuce in a bowl with the chicken or shrimp, if using. Pour the dressing over and toss well. |