Sahih Bukhari Volume 007, Book 065, Hadith Number 291.

Narrated By Anas bin Malik : A tailor invited Allah's Apostle to a meal which he had prepared. I went along with Allah's Apostle and saw him seeking to eat the pieces of gourd from the various sides of the dish. Since that day I have liked to eat gourd. 'Umar bin Abi Salama said: The Prophet, said to me, "Eat with your right hand."