In the bowl of a food processor, combine 1/4 cup Parmigiano, lemon zest and juice, garlic, the Dijon, anchovies, and Worcestershire. Puree until the mixture is smooth, 15 to 20 seconds. With the machine running, add 1/4 to 1/3 cup olive oil through the feed tube. Let the processor continue to run for another 10 to 15 seconds. Taste and season with salt if needed.