Peel the whole mangoes. You can use a peeler or a knife or both!
Cook the whole peeled mangoes with water in a pressure cooker for 2 to 3 whistles. Alternately, you can grate them finely.
Once completely cooked, mash the mangoes to a pulp.
In a kadai, heat oil and splutter mustard seeds. Follow with red chillies and hing.
Add the mango pulp and mix well. Season with salt.
Once everything is well mixed, add the jaggery powder and stir again.