Step 1: If you would like the preserve to be more like jam, then run the mango a couple of times in the blender.
Step 2: Put all the ingredients, except the ginger in a microwave safe bowl. Mix and then cook at 100% for ten minutes.
Step 3: Now add the ginger, stir well and microwave at 80% for another 8 minutes. Allow the preserve/ jam to cool. It will thicken a little bit.
Step 4: Bottle and refrigerate. You might have to adjust your cooking time depending on the variety of mango.
Step 5: Similarly, you might need to adjust the jaggery/ brown sugar required depending on the sweetness of your mangoes.