Watermelon Rind Preserves
["rind of 1 lemon", "rind from 1 (5 lb.) watermelon", "3/4 c. pickling lime", "water", "1 Tbsp. alum", "1 1/2 lb. sugar", "8 c. hot water", "1 large can sliced pineapple, drained and chopped (optional)"]
["Remove green rind", "and", "red", "pulp from watermelon rind. Cut rind (white", "part)", "into", "even", "one-inch", "square", "pieces. Combine lime in", "water", "to", "cover", "rind.", "Let stand overnight. Rinse thoroughly.", "Soak rind", "in alum and water to cover for 2 hours. Rinse thoroughly.", "Cover rind with cold water and boil until slightly tender", "when", "pierced", "with fork (about 25 minutes). Melt sugar in", "8", "cups", "of", "hot water.", "Place rind and drained, chopped pineapple", "in sugar water and cook until rind is transparent.", "(Add boiling water if syrup becomes too thick during cooking.) Pack in hot sterile jars and seal."]
["rind from", "pickling lime", "water", "alum", "sugar", "water", "pineapple"]