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1.
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In a small saute pan, saute mushrooms on medium high in 1 tablespoon of butter until cooked throughout and slightly golden.
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2.
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Now to make caramelized onions: In separate saute pan, heat another 1 tablespoon of butter and add in sliced onions.
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Saute on medium high until translucent and soft.
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Add in brown sugar and allow to melt in.
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Then pour in beer 1/4 cup at a time.
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Allow beer to completely dissipate before adding more beer and then season with salt and pepper.
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3.
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Season tenderloin with oil and salt and pepper and grill on a BBQ for 7-10 minutes, turning once or twice.
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You want the meat to be just over rare when done.
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4.
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When the meat is done, allow to rest for five minutes and then begin slicing into the thinnest slices possible.
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Use a very sharp knife for this (DO NOT use a serrated blade).
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5.
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In a small sauce pan melt the remaining 4 tablespoons (1/4 cup) of butter with the garlic and allow to cook for 5 minutes.
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Brush this on the loaf (sliced in half and then horizontally to make a sandwich).
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6.
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Heat broiler in oven to high, pile meat onto the buttered loaves, top with cheese and broil until golden and bubbly.
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Done!