In a normal pot clean the potatoes and split it properly.
Then de-seed the dates and the chop the dates properly
In a pan keep some oil on a normal pan, include the mustard seeds. Once the seed starts popping, include the tomatoes, greed chili and salt. Mix at properly.
Then with the ½ cup of water include the dates in the above mixture
Keep it on a gas till the tomatoes are mashed. Add the jaggery and sugar as well. If you want, you can also some more water. Keep it on the gas till the jaggery gets properly dissolve in it.
Now you can serve it hot with chapattis.