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In a small sauce pan melt 1 tbsp butter.
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Add minced onion, garlic and mushrooms.
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Cook until nice and soft.
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Add 1/2 cup white wine and simmer on low until it reduces by 3/4.
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In a sauce pot or pan melt 2 1/2 tbsp butter.
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Stir in the flour creating a roux.
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With a whisk, mix in the milk a little at a time to avoid lumps--whisk hard and lots.
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When the mixture is smooth, pour in the cream, mix in the basil pesto, salt, Worcestershire sauce, Tabasco sauce and mushroom onion garlic wine mixture.
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Mix well--pepper to taste
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Stir in the parmesan cheese, blending well; set aside.
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This sauce can be made hours ahead of time, simply reheat on your cook top on low or microwave for 30 seconds.
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Drizzle over your favorite meal. I have shown this sauce served over stir-fried vegetables and shrimp on pasta.