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Essence of Rennet
Knead together 12 ounces fresh rennet cut small, and 3 ounces common salt; leave the mixture for 5 or 6 weeks in a cool place; then add. 18 ounces water, and 2 ounces good rum or proof spirit. Digest for 24 hours; filter, and color with a little burnt sugar. 2 or 3 teaspoonfuls will curdle a quart of milk.