Ingredients:
Set up the grill for
direct grilling and preheat to high. Place the chuck and sirloin in a
large mixing bowl and mix with a wooden spoon, or mix the meat in a
stand mixer fitted with a dough hook. If possible, avoid mixing the
meat with your hands so your fingers don't warm it.
Wet your hands with cold water and divide the meat into 8 equal
portions. Working quickly and with a light touch, pat each portion
into a 1/2-inch-thick squarish patty. Generously season each patty on
both sides with salt and pepper. Press an onion wedge into one side of
each patty so that it's flush with the meat.
Lightly brush the bread slices with the butter, if using. Arrange the
tomatoes and lettuce leaves on an attractive serving platter.
When ready to cook, brush and oil the grill grate. Place the burgers
on the hot grate, onion side down. Grill the burgers until cooked to
taste, 3 to 4 minutes per side for medium-rare. To test for doneness,
insert an instant-read meat thermometer through the side of a burger
into the center. The internal temperature should be about 145°F for
medium-rare or, if using commercial ground beef, cook it to at least
medium, 160°F.
Meanwhile, place the bread slices on the hot grate and grill until
lightly toasted, 1 to 2 minutes per side.
To serve, place a lettuce leaf on top of a slice of toast. Top with a
burger, tomato slice, and Cheese Sauce, if using. Slap a piece of
toast on top and serve at once.
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