INGREDIENTS
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1 1/2 pounds ground beef chuck
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About 1/4 cup Worcestershire sauce
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3 tablespoons grated onion
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Coarse salt and pepper
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1 tablespoon vegetable oil
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4 deli slices (not too thin) Emmentaler cheese
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3 tablespoons butter
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1 pound white mushrooms, sliced
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1 shallot, finely chopped
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1/3 cup dry sherry
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1 cup sour cream
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1/4 to 1/3 cup buttermilk
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1/4 cup finely chopped dill, parsley, chives and thyme
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1 tablespoon fresh lemon juice
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1 tablespoon hot sauce
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1 clove garlic, grated
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4 brioche or other soft rolls, split