Mhanna has been at the helm of Blackspoon Management since 2021, which specializes in managing and operating restaurants. The company has multiple brands under its umbrella, including Ibn AlBahr, Allo Beirut, MASTI, House of Curry, Nafas Beirut, and MICHELIN Guide restaurant Bombay Bungalow. In December 2023, Jadwa Investment fully acquired Blackspoon Management. In May 2024, the company announced the opening of Allo Beirut in Al Olaya in Riyadh, Saudi Arabia, and it opened its newest branch in Ras Al Khaimah in June. Mhanna was previously the general manager of Leylaty Group, and the CEO of Aura Group, Al Bustan Investment Group, and Re-Marks Hospitality.