Markle joined the women from the Hubb Community Kitchen to cook a meal of coconut chicken curry, aubergine masala and chapatis beneath a tent set up near Kensington Palace.
A group of women came together after the blaze to cook for the community.
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"Working on this project for the past nine months has been a tremendous labour of love", Meghan said. She wrote the book's forward.
Looking elegant in a fawn coloured two-piece ensemble with a matching shawl draped across her shoulders, the 62-year-old simply introduced herself to guests, saying: "Hi, I'm Meg's mum", according to Daily Mail.
Other guests include members of the local community, representatives from Ebury Press, Al Manaar Muslim Cultural Heritage Centre and The Royal Foundation.
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Meghan says she felt "embraced" by the women from the community kitchen after just moving to London.
One of the contributors to the book, Munira Mahmud, 34, told how Meghan donned an apron and mucked in with the cooking, including washing rice.
Zahira Ghaswala, the Hubb's co-ordinator who hosted Meghan's first visit to the kitchen, said about the book's sales: "As far as I know, on Amazon we're number one - everything's just been a positive vibe out there. Melding cultural identities under a shared roof. creates a space to feel a sense of normalcy - in its simplest form, the universal need to connect, nurture, and commune through food, through crisis or joy - something we can all relate to".
"To the women of the Hubb Community Kitchen, thank you so much for allowing me to be part of this adventure with you". Meghan was inspired by the project and how it empowers women at a grassroots level.
Begum Kulsoom, wife of former Pakistan PM Nawaz Sharif, dies in London
Politicians from various political parties and high-level government officials also expressed deep grief over the death. Born into a Kashmiri family in Pakistan's Punjab, Kulsoom graduated from the Forman Christian College University.
We also think it's wonderful to bring her mother along here.