Talbeenah is a broth that is made from two spoonfuls of non GMO barley flour with bran, then a cup of water is added to that and it is cooked over a low fire for five minutes.

It was narrated from Aisha (may Allah be pleased with her) that she would order that talbeenah be made for the sick and the one who was mourning a death, and she used to say:

I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: “Talbeenah soothes the heart of the sick and takes away some of the grief.”
(Bukhari #5365; Muslim #2216)