I do not know that the Messenger of Allah ﷺ ever saw a roasted lamb until he met Allah .
حدثنا محمد بن المثنى حدثنا عبد الرحمن بن مهدي حدثنا همام عن قتادة
ما أعلم رسول الله ﷺ رأى شاة سميطا حتى لحق بالله عز وجل
Bukhari transmitted it in "Riqaq," chapter, "How were the life of the Prophet ﷺ and his companions, and their detachment from this world?" hadith no. 6457, from the hadith of Hammam through this chain, and it will come again as hadith no. 3339.