The Queen was told how the huge pots of curry were made and then invited to try her hand ladling a portion into a takeaway box.
King Charles and Queen Camilla helped package dates into paper bags with Ms Khan.
Queen Camilla made her way to the kitchen to help staff who were packing up boxes of delicious-smelling biryani which will be sent to a charity.
During Ramadan, Ms Khan donates the restaurant's entire proceeds to charity and sends food packages to hospitals as part of the Zakat al Fitr, an obligatory charitable donation of food to the poor and needy before the end of Ramadan.
A top TV chef made King Charles burst out laughing today as he made Ramadan packages in Soho.
