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1
Put the mushrooms In a small bowl and add the hot water. Cover and set aside for about 20 minutes for the mushrooms to hydrate.
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2
Combine the beef, Worcestershire sauce, marjoram, and pepper in a bowl. Set aside.
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3
Squeeze the mushrooms dry, and discard the soaking liquid or reserve it for another use. Mince the mushrooms and combine the mushrooms with the cheese, scallions, and salt. Divide the cheese mixture into 6 equal portions, flattening each into a thick patty about 2 1/2 inches in diameter.
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4
Divide the meat Into 12 portions, and flatten each into a thin patty. Set a cheese patty on 6 of the beef patties, and top with the remaining beef patties. Press the edges of the patties closed to seal tightly and hold in the juices during grilling. Refrigerate until ready to grill.
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5
Prepare a charcoal or gas grill, Lightly spray the grill rack with vegetable oil cooking spray. Light the coals or heating elements. and let them burn or heat until moderately hot to hot.
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6
Grill the burgers for about 5 minutes. Turn and grill for 4 or 5 minutes longer for medium-well burgers. Use a large spatula when turning the burgers, taking care that they do not split.
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7
Dried mushrooms are sold in packages containing several different kinds. This mixture works well here, or buy loose dried mushrooms.
