- Take yogurt in a bowl and whisk till smooth. Add cardamom powder, 1 tablespoon rose water and ½ tablespoon crushed dried rose petals and whisk well. Add castor sugar and whisk till the sugar dissolves completely. Add malai and whisk till smooth. Spread some pistachios and almonds on a plate and mix them well. Take rose syrup in a bowl, dip the rims of tall serving glasses in the syrup and coat them with pistachio-almond mixture. Pour lassi into the glasses, sprinkle some crushed dried rose petals on top and serve immediately.