This all-purpose last-minute dressing is ideal for crunchy lettuces. With two small additions, you can turn it into a luxurious Caesar vinaigrette.
In a small bowl, combine the lemon juice and garlic and season with salt and pepper. Add the lemon zest. Whisk in the oil. Toss the vinaigrette with the lettuce, season with more pepper, and garnish, if desired, with the Parmigiano-Reggiano.