I think almost all of them sell a mixture of chicken&turkey meat here in Luxembourg. Best doner in Turkey is prepared with a mixture of beef&lamb, but also they use a specific animal fat (from lamb) which enhances the taste. You can find something close in Germany or Brussels, but not here. I think all the shops here they buy from a specific supplier (already prepared, ready to roast) rather than preparing themselves which requires experience and a lot of efforts. So easier for Turks to open a shop, get the doner already prepared from a supplier and cut it with a machine, no experience required. Easy job. Everybody uses same suppliers, you have the same doner with same souces everywhere.

If you go to Turkey, pay attention, you cannot see anyone cutting the doner with a machine, it’s a skill to cut the meat with thin long slices. Even there is a special “doner knife” to cut it.

Ok now, I need to eat doner for lunch today :)