Slice, if necessary, and butter all the buns on the inside cut. When
the grill is hot, carry the burgers, buns and blue cheese out to the
grill. Place the burgers on the grill using a spatula to get them off
the cutting board. Close the lid and cook for 90 seconds. Flip the
burgers and stir the onions. Add all the buns to the grill, buttered
side down. Close the lid and allow to cook 60 seconds. Remove the
buns and immediately top with a burger, a tablespoon or so of blue
cheese and caramelized onions. Repeat until all burgers are
assembled. Allow to sit for 2-5 minutes before serving.
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