Al-Bara bin Azib (may Allah be pleased with him) says: We were with the Messenger of Allah (peace and blessings be upon him) and we cooked the meat of domestic donkeys; then he (peace and blessings be upon him) told a caller (to announce): "Let the pots be overturned."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19454