For the dressing: Put the vinegar, Parmesan, Worcestershire, anchovies, egg yolk, lemon zest and juice and garlic in a blender and blend to combine. With the blender running, slowly drizzle in the oil to emulsify. Season with salt, pepper and hot sauce (if desired). Note: if the dressing is too thick, you can thin it by adding a few drops of water while the blender is running.
For the salad: Put the baby kale in a large mixing bowl and add the lemon juice and a pinch of salt. Using your hands, gently massage the kale with the lemon juice for 1 minute, then allow to sit for 5 minutes. Dress to taste with the Caesar dressing and additional salt and pepper. Serve in individual bowls topped with the Pecorino-Romano and croutons.
Any extra dressing can be stored in the refrigerator in an airtight container for up to 3 days.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.