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Step 1
Mix liquid seasoning and Worcestershire sauce together with garlic in a bowl. Pour over prime rib in a container. Marinate, turning every 30 minutes, 1 to 2 hours.
Step 2
Preheat the oven to 450 degrees F (230 degrees C).
Step 3
Place prime rib on a baking rack set inside a large baking dish.
Step 4
Bake in the preheated oven until all juices are sealed in, about 45 minutes. Reduce temperature to 325 degrees F (165 degrees C) and continue roasting until an instant-read thermometer inserted into the center reads 130 to 140 degrees F (54 to 60 degrees C), about 2 hours more. Let sit 30 minutes to 1 hour before slicing.