n In a medium bowl, mix together the onion, both kinds of cheese, mayonnaise,and pimentos. Add in lots of black pepper and stir. Set aside or refrigerate until ready to use.n In another bowl, combine the ground beef with a few teaspoons of worcestershire, and salt and pepper to taste. Divide into 6 equal sized patties about 3/4 inch thick. Make sure you put a slight indentation in the center of each patty.n Oil the grill racks and preheat your grill on high with the lid closed for 10 minutes.n Place the burgers on the grill and lower the heat to medium. Grill for 5 minutes and then flip burgers over. Continue cooking for 4 more minutes or until the burgers have reached desired doneness.n During the last 2 minutes of cooking add the buns to the grill cut side down. Add lots of the pimento cheese mixture to the top of each burger.n Take the buns off the grill when they are lightly toasted and add your burgers.n