Coarsely chop jaggery with the help of knife & set side.
In small jug,add water and basil seeds,mix well and let it soak for 8-10 minutes & set aside.
In blender jug,add water,jaggery,lemon juice,salt,mint leaves & blend well.
In serving jug,add ice cubes,soaked basil seeds and gur mint sharbat,lemon slices,stir & serve!