Turkey's biggest casual dining chain, Big Chefs, sold a minority share to an internationally backed private-equity firm, in a sign that resilient consumer demand is drawing some investors to the country despite July's failed coup rattling the economy.

Taxim Capital, which is based in Jersey, bought a 40% stake in Big Chefs on September 7, said Kerim Kotan, managing director of Pragma, the investment bank that advised the Istanbul-based restaurant company on the sale. The agreement hasn't yet been publicly disclosed, and Kotan declined to specify the value of the deal.