The duchess, who has been privately visiting the cooks, added: "I had just recently moved to London and I felt so immediately embraced by the women in the kitchen - your warmth, your kindness, and also to be able to be in this city and to see in this one small room how multi-cultural it was".
Earlier this week Kensington Palace released a video of Meghan cooking with the women in support of the new recipe book - called Together: Our Community Cookbook - which aims to raise money to support the local kitchen.
British media said it was unheard of for family members to be involved in official royal engagements, saying Ragland, who had not been seen in public with her daughter since the wedding, had told guests on her arrival: "Hi, I'm Meg's mom". She wrote the foreword for the book.
Meghan appeared to be happy with her husband's efforts, and giggled along with everyone else.
This is the first time she has visited the United Kingdom since her daughter's wedding in May, and the first time the two have been seen together since the big day.
There was a large range on the menu, including coconut chicken curry, aubergine masala and a range of chapatis and sharing dips.
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The duchess was wearing a striking petrol blue long coat by one of her favourite Canadian brands, Smythe - which sold out within minutes - with a pleated midi skirt by her friend Misha Nonoo, a high neck bodysuit by Tuxe and black suede Sarah Flint heels.
Now they've launched a recipe book to benefit the community. "I'm so privileged to know you", Markle continued.
"I said in the foreword, this is more than a cookbook and what I mean by that is that the power of food is more than just the meal itself it's the story behind it" the Duchess said.
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".
Her Royal Highness first visited the kitchen in January 2018 on a private visit and had made many more visits since.