Take fennel, black pepper and sugar in a mixer jar and grind finely.
Place the ground mixture over a sieve and strain it.
Again grind the left over chunks over the sieve along with sugar. Strain again and collect in a bowl.
After this, add almonds, pistachios, melon seeds, cardamon powder,rose petals, khus-khus and remaining sugar in the mixer jar and grind finely.
Mix this to the fennel and black pepper mixture and mix thoroughly. Strain this mixture again through a sieve to mix it well.
Thandai powder is now ready.
For making Thandai of Thandai powder:
Take some milk in a glass and add 7 tsp thandai powder to it and stir to mix up thoroughly.
Keep this mixture aside for half an hour. After half an hour, mix this thandai mix milk to the remaining milk along with some ice cubes and place it in a mixer jar.
Mix until ice cubes blends well. Thandai is ready, transfer it a glass.
Garnish the thandai with some pistachios.
Serve this chilled and super delicious thandai.
Store the thandai powder in any air tight container.