If the Iqāmah for prayer is proclaimed, and the dinner is served, start with the dinner. [Sahih/Authentic]
"«إِذَا أُقِيمَت الصَّلاَة، وحَضَرَ العَشَاء، فَابْدَءُوا بِالعَشَاء». [صحيحة.] -"