If the Iqāmah for prayer is proclaimed, and the dinner is served, start with the dinner
Authentic hadithعن عائشة وعبد الله بن عمر وأنس بن مالك رضي الله عنهم مرفوعاً: «إِذَا أُقِيمَت الصَّلاَة، وحَضَرَ العَشَاء، فَابْدَءُوا بِالعَشَاء».
‘Ā'ishah, ‘Abdullāh ibn 'Umar, and Anas ibn Mālik (may Allah be pleased with them) reported that the Prophet (may Allah’s peace and blessings be upon him) said: "If the Iqāmah for prayer is proclaimed, and the dinner is served, start with the dinner."
Explanation
If the Iqamāh for prayer is proclaimed, and food or drink are served, one should start with food and drink; in order to satisfy his appetite, and his mind should not be busy with the food.
Source · Narrated by Bukhari & Muslim due to its all chains of narrators
From the Hadith Encyclopedia (hadeethenc.com).