Peel the ash gourd and cut it into small pieces. Keep it aside in a large bowl. Once done with it, squeeze one lemon and keep it's juice in a small bowl.

Now, take the ash gourd pieces and prick them using a fork. Take a large pan and fill it with water, put the pricked ash gourd pieces in it and add alum powder. Put the pan over medium flame and let it boil for about 12-15 minutes. Once boiled, take it off from the flame and drain the water. Rinse the pieces thoroughly under cold water.

In a pan, take about 2 cups of water and add equal amount of sugar to it and cook over medium flame. Once the sugar gets completely dissolved in it, add lemon juice to the sugar syrup and put the flame to low setting from medium. Add red food colour that is optional, and add rose flavour water. Now, add the cooked ash gourd to it. Cook until the ash gourd completely soaks up the syrup.