Preparation:
In a food processor or blender puree the sorrel, the parsley, the garlic, the Parmesan, the pine nuts and the oil, transfer the pesto to a jar with a tight fitting lid and chill it, covered. The pesto keeps, covered and chilled, for 2 weeks. Makes about 1 cup.
To use the pesto: For every pound of dried pasta cooking in a kettle of boiling water, stir together in a heated serving bowl 3/4 cup of the pesto and 2/3 cup of the hot cooking water. When the pasta is al dente, drain it in a colander, add it to the pesto mixture, and toss the mixture until the pasta is coated well. Vermicelli works very well with this recipe.
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