Nidokoenig, I'm also having the issue where if a prepared meal uses only one type of plant, my conjurer uses it, and there go all my masterwork muffins. Another thing that seemed kind of odd is that in my 30 odd worlds I've genned (I love legends mode) I have yet to find a god or goddess which actually uses the royal pony.
Tally up your gods, it is odd if royalty aren't appearing at least as often as one in 36. I'm sure I remember seeing underlord gods, but I'm not really paying much attention when I look at them, I'm usually checking for gods of lust, depravity and anything else. Had one whose third association was happiness, which sounds about right. I honestly don't know how I'd change this, unless I do something like add spheres to royals, if that even works at caste level.
For the prepared meal thing, it might be possible to change this by making the conjure reaction more specific, but I think if the tag is being transferred over, that's buggy behaviour on DF's part. The reaction specifies PLANT, i.e. plant, not FOOD, i.e. prepared meal, so I've got no idea how a meal qualifies. You are using the latest version, right? I added the specific mention of PLANT after Dsarker's problem a few pages back getting painting to work. I've got no idea how to make it more specific without specifying an actual plant, so apart from advising you to get around it with burrows or always improving your basic plants before cooking, I've got nothing.
Try forcing a brewer to brew a plump helmet cupcake with burrows, that should give us a better idea of where the problem lies.
I'll get about putting basic guide together.
Oh, and Telgin, little trick with conjured wood: burn it for potash, fertilise the fields, get even more wood next season.