"4..."
INGREDIENTS
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5 tablespoons butter, divided
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3 large onions, thinly sliced
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Salt and pepper
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1/4 teaspoon ground thyme
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1/4 cup dry sherry
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1/2 cup beef stock or beef consomm
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1 1/2 pounds ground chuck or sirloin
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2 tablespoons Worcestershire sauce
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2 tablespoons finely chopped parsley
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2 tablespoons Dijon mustard
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1 tablespoon EVOO Extra Virgin Olive Oil
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8 slices good quality white bread
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8 slices Gruyre or Swiss cheese
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Cornichons, for garnish