Oil a grill pan and heat over medium-high heat.
Grill the burgers, flipping once, until cooked
through (160°F), about 15 minutes total. If
there’s room on the pan, grill the onion slices at
the same time, flipping once, until tender, about
7 minutes. Otherwise, keep the burgers warm,
covered loosely in foil, while you grill the
onion.
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