Using colatura di alici (anchovy syrup) rather than anchovies or anchovy paste is quick and easy and gives this Caesar dressing wonderful, mouthwatering richness.
Mince the garlic as finely as possible or use the side of a knife to scrape it into a fine paste against a cutting board. Place the garlic, egg yolks, lemon juice and zest, colatura and mustard in a blender and process for 15-20 seconds. With the blender running, slowly drizzle in the olive oil until the dressing is nicely emulsified. Blend in the cheese, reserving a bit to sprinkle over the finished salad. Season to taste with black pepper, toss with romaine lettuce and serve.