158. Sorrel Sauce, or Purée.—Wash well four handfuls of sorrel, put it nearly dry into a middle-sized stewpan, with a little butter; let it melt, add a tablespoonful of flour, a teaspoonful of salt, half one of pepper, moisten to a thick purée, with milk, or broth, or cream; pass it through a sieve, put it back in a stewpan, warm again, add two whole eggs, two ounces of butter, and stir well, and serve where directed.