How to permanently tame a Camel as mount?

I've fed the Raptor with meat and got it permanently

I've fed the Iguana with Onions and got it as well

Bears can be fed with fish to be permanent mount too

Kuku bird just need to be hatched

(You have to be riding the animal and them select the food in your inventory, there is an option called "feed")

I did all that, but I can't figure out what to feed the Camel. Has anyone been able to tame it?

I'm talking about having the camel permanently registered as a special mount, not just ride it.

I'm riding one right now (as I write this) and I've tried a couple of different foods. It will eat onions, garlic and hay, but no trust is raised feeding it with these options.

Can anybody help? What food should I give to it in order to raise trust?