Powder sugar and cardamom separately. In a heavy - bottomed pan, melt vanaspati / butter gradually on medium low fire. Add the soya and gram flours and keep stirring till the mixture turns light brown. Remove from fire and allow to cool. Mix powdered sugar and cardamom as well as finely chopped pista. Take 1 / 3 cup of this mixture, press between your palms and roll around until it becomes a firm ball. Serve as a dessert.