Watermelon Rind Pickles

6 cups watermelon rinds, peeled and scraped
2 cups vinegar
2 cups water
4 cups sugar
1 stick cinnamon
1 tsp. whole cloves
1 tsp. whole allspice
1 lemon, sliced thin

Cut rinds into cubes; soak in water overnight. Wash and drain. Boil rinds until tender. Combine ingredients and boil for 5 minutes. Add rind, a few pieces at a time, cook until rind is clear. Pack in hot, sterilized jars. Pour syrup on top. Seal jars.