This is an excerpt from An Anonymous Andalusian Cookbook
(Andalusia, 13th c. - Charles Perry, trans.)
The original source can be found at
David Friedman's website
Roast Calf, which was made for the Sayyid Abu al-'Ala in Ceuta. Take a young, plump lamb, skinned and cleaned. Make a narrow opening between the thighs and carefully take out everything inside of it of its entrails. Then put in the interior a roasted goose and into its belly a roasted hen and in the belly of the hen a roasted pigeon and in the belly of the pigeon a roasted starling and in the belly of this a small bird, roasted or fried, all this roasted and greased with the sauce described for roasting. Sew up this opening and place the ram in a hot tannur and leave it until it is done and browned. Paint it with that sauce and then place it in the body cavity of a calf which has been prepared clean; sew it up and place it in the hot tannur and leave it until it is done and browned; then take it out and present it.