Sahih Bukhari Volume 007, Book 065, Hadith Number 312.
Narrated By Khalid bin Al-Walid : "A roasted mastigure was brought to the Prophet who stretched his hand towards it to eat it. But it was said to him, "It is a mastigure." So he withdrew his hand. Khalid asked, "Is it unlawful to eat?" the Prophet said, "No, but it is not found in the land of my people and that is why I do not like eating it." So Khalid started eating (it) while Allah's Apostle was looking at him. An-Nadr said: 'Al-Khazira' (is prepared) from bran while 'Al-Harira' is prepared from milk.