Bring 3 quarts water to a boil in a large saucepan. Add rind; cook 3 minutes. Drain well.
Combine sugar and remaining ingredients in pan; bring mixture to a boil. Reduce heat, and simmer 2 minutes. Stir in watermelon rind; simmer, uncovered, 30 minutes or until most of liquid is absorbed, stirring frequently. Cool; pour relish into airtight containers.
Note: Refrigerate Watermelon Rind Relish in airtight containers up to two months.