The Duchess' mother Doria Ragland also made a surprise appearance at the event, where the couple invited women from the Hubb Community Kitchen to showcase their creations to members of the local community, representatives from Ebury Press, Al Manaar Muslim Cultural Heritage Centre and The Royal Foundation.
All the recipes came from women left homeless by London's Grenfell Tower fire a year ago.
Meghan championed the idea of a cookbook whose sales will hopefully help keep the kitchen open seven days a week, and also support other related projects.
The Palace announced the royal foodie's support on Monday of Together: Our Community Cookbook, which will benefit a community kitchen founded as a necessity after the deadly June 2017 Grenfell Tower fire, which left the apartment building's tenants with nowhere to prepare meals. She was "inspired by how the project empowers women at a grassroots level". And the pair looked as chic as they did happy, with Meghan clad in a royal blue coat by Smythe over a turtleneck bodysuit by TUXE Bodywear and a pleated skirt by her pal Misha Nonoo, while Doria looked elegant as ever in a beige sweater with coordinated pants and a matching scarf draped over her shoulders.
Meghan Markle, the Duchess of Sussex, has proved her reputation as a revolutionary royal at her first solo regal charity project.
She marked the occasion by giving her first public speech as a duchess, saying: 'Working on this project for the past nine months has been a tremendous labour of love'.
Meghan gave a 3-minute speech without notes thanking the women of the Hubb. "I could not be more excited about it and proud of you".
"I immediately felt connected to this community kitchen; it is a place for women to laugh, grieve, cry, and cook together", writes Markle in the book. Needless to say, she nailed it! "I'm so privileged to know you", she said.
But the cutest moment came when Meghan was mingling with guests and the wind blew her hair up.