Master 4 cooking, I tested to use just 1 meat.
and... it worked.
I will test it in mass, I guess it can fail, but... I will update it!
(Sorry for the german item name...but I think... the numbers are enough for all)
Okay it fail sometimes, then you have to click Enter/space and he will continue. So its some "active cooking".
Update with 3 meat it works for me 100% so you can reduce your meat cost to 50%!
Master 5 cooking