Set a heavy bottomed saucepan on medium heat. Add all the ingredients except the watermelon rind and bring to a boil.
Once boiling, add the shredded watermelon rind. Wait until the mixture starts boiling again. At this point, turn the heat to medium low, cover and cook for 45 minutes. See notes.
After 45 minutes, remove the lid and cook for another 10 minutes or until a thick, chutney like consistency is reached.
Cool the chutney and store in a clean, air tight jar (preferably glass) for upto a month in the refrigerator.
Enjoy it with toast, paranthe or anything, really.