After watermelon completely cools down, add vanilla essence and take 4 bowls. (preferred glass bowl) Divide watermelon rend info equal parts with the sugar syrup. Add the food colour whichever you prefer. Leave it overnight for minimum 6 hours in the syrup.

After 6 hours remove the watermelon rind from the syrup and shadow dry the tutti frutti for upto 6 to 7 hours. Now you can store this in a airtight glass jar. Is it on your cupcakes, cakes, muffins and whatever.

Note: use only watermelon white part. Never add food colour or essence in the hot what wait until it is completely cool down. Always use organic food colour, even once a while is ok but not always.