The restaurant and bar will open on Baker Street in August with former Barbecoa executive chef Hus Vedet as executive chef.
The site will aim to 'bring together the three pillars of Istanbul's social and eating out culture - meyhane, mangal and seafood from the Bosphorus-adjacent restaurants of the capital city - all under one roof.'
Vedet, who helped create Caxton Grill at the St Ermin’s hotel before joining Jamie Oliver's steakhouse and barbecue restaurant Barbecoa, has created a menu which is divided into cold meze, hot starters, mangal clay oven and sides with dishes to include Kirmizi Biber (oal roasted bell peppers, lime zest); Levrek Marine (marinated sea bass, grapefruit, fennel, lime, green chilli, basil) and Manti (Turkish dumplings stuffed with lamb neck, yoghurt sauce, chilli, oil, mint.)
Many of the ingredients, including whole fish and lamb butchered on-site, will be pit-roasted over coal in the restaurant's open kitchen.
London-born Vedet who has Turkish origins, said: "My food philosophy is simple: choose good ingredients from producers that are passionate. Treat those ingredients with respect. Lick them with fire and let them shine. For Yosma, I will be exploring influences and flavours from my heritage. I want to showcase the depth, character, and history of Anatolian food and drink (while having fun) and sharing the fascinating stories behind one the the world’s most prominent cuisines."
The site, designed by Afroditi Krassa, will also include a raki lounge bar with interiors chosen to reflect the feel of a traditional meyhane, or tavern.
Drinks consultant Matt Whiley has created a cocktail menu based around Turkey's national aperitif. The menu includes Ya Sonra (Raki, olive, fennel pollen, sparkling wine) and Gul Pembe (Pink peppercorn, rose vermouth, Campari, raki, mint and cucumber dilution).
A 26-strong wine list features a number of Turkish wines, with Efes beers to be available alongside a rotating draught guest ale.
Yosma will be open for lunch and dinner from the end of August with breakfast launching at a later date.
Good Food Society was founded by Levent Büyükuğur and Sanjay Nandi in 2013 with the intention of developing new hospitality concepts across the globe. The company opened Italian restaurant Ristorante Frescobaldi London in Mayfair in partnership with the Frescobaldi family in 2014.