In a saucepan, melt the butter over a medium heat and then add the flour. Whisk vigorously. Gradually add the milk and continue whisking until the sauce coats the back of a spoon. Season and add the grated truffle. Put to one side.
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In a saucepan, brown the sliced mushrooms and then the sliced garlic in the truffle oil. Add the chopped parsley, followed by the salt, pepper and paprika.
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Fill each cannelloni tube with the mushroom mixture.
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Pour some of the truffle bu00e9chamel in an oven dish. Arrange the cannelloni evenly. Pour the rest of the bu00e9chamel over the cannelloni and garnish with the grated Parmesan.
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Bake for 30 minutes. Serve with a mixed green salad.