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Walnut Vinegar

Prepare some brine sufficiently strong to float an egg, then put some green walnut shells in it, and allow them to soak for fourteen days. At the end of that time drain the shells, and leave them in the sun for nine days. Place the shells in a large stone jar, cover them well with boiling vinegar, and leave them for a week. Drain the vinegar off the shells, boil it up again, and pour it over the shells. Keep the jar closely covered until ready to use the vinegar.