It wasnarrated from Ibn 'Abbas that the Messenger of Allah (ﷺ)said:
"Whoever is given food by Allah, let him say: Allahumma bariklanafihi wa arzuqna khairan minhu (O Allah, bless it for us andprovideus with something better than it). And whoever is given milkto drinkby Allah, let him say: Allahumma barik lana fihi wa zidnaminhu (OAllah, bless it for us and give us more of it). For I do notknow ofany food or drink that suffices, apart from milk."
English reference: Vol. 4, Book 29, Hadith 3322
Arabic reference: Book 29, Hadith 3447