Iranian Sweet Dish consisting of Lamb Paste
As confirmed in comments, the dish is khoresht mast.
According to this recipe and this video, the main ingredients seem to be lamb or beef neck, yoghurt, sugar, saffron, rosewater, and garnishes of pistachios and barberries.

The lamb/beef is simmered with onion and turmeric then mashed and blended, and mixed with an egg yolk, yoghurt, and sugar. This is gently heated, to which saffron water and and (optionally) rosewater are now added. The mixture is then chilled, garnished, and served cool. The video explains everything quite well.