Take the waste part of watermelon and with the help of peeler or knife, remove the outer skin which is dark green.

From internal side too, remove the red spots, if any.

Now you are left with light greenish scrap which is called rind and we are going to use it.

Cut that rind into small dices as shown in picture. After cutting rind into dices, we had about 4 cups of rind dices in hand.

Take 5-6 (roughly) cups water in a pan and let it come to boil.

Add rind dices and let them boil on low to medium heat.

In 10 to 12 minutes, we will find the dices turning translucent/semi-transparent.

Switch off the heat and pass the rind dices through a sieve so that water drains from them.

In the same pan, add sugar and 2 cups of water. Also add mix fruit essence. If mix fruit is not available, you can safely go with vanilla essence.

When the sugar melts, add boiled rind dices and let them boil in sugar syrup on low to medium heat.

Boil them for 10-12 minutes and thereafter switch off the heat. Dices must have soaked most of the sugar syrup, though there's still remain some syrup at the base of pan.

Take 4 small bowls and add rind dices in all bowls in equal proportion. While adding dices, do let some sugar syrup too shift in bowls.

Add few drops of red food colour in one bowl, green in second, yellow in third and fourth bowl should be left as it is with no colour. Mix all the colours well.

Drain the syrup from these bowls one by one by passing them through a sieve.

Spread the rind dices on a tray or kitchen towel and let them turn completely dry. It will take about 1 to 2 days in completely evaporating their moisture.