Preheat a grill to medium-high.
Combine all the ingredients in a bowl and mix gently but thoroughly. Divide the mixture into 4 equal portions and form into patties. Grill the burgers for 4 to 5 minutes on each side, or until all pink disappears. Place the buns on the grill, inside down, until just warmed through, about 30 seconds. Remove the patties and buns from the grill and place on serving plates. Garnish with condiments and serve immediately.
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