"Mushrooms, shallots, garlic, and port wine make a fabulous pan sauce for fresh tuna seasoned with crushed peppercorns...."
INGREDIENTS
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4 (5 ounces each) portions sushi-grade Ahi tuna
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2 Tablespoons crushed black peppercorns
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1 Tablespoon canola oil
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1 pound oyster mushrooms, sliced
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2 ounces leeks, sliced
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2 teaspoons chopped garlic
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2 teaspoons chopped shallots
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2 cups port wine
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2 Tablespoons sweet butter
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2 large Russet potatoes, peeled
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3 ounces sweet butter
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4 to 6 ounces milk
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Salt and pepper to taste