"Non, les recettes de légumes."
I'm at the same level as you Leshyk. I interpreted the sentence the same as you, but noone would say recipes of vegetables in english, but then again we wouldnt say the recipes of crepes either which is marked as correct. It should be consistent at least.
why is is: "Non, les recettes de légumes." and not "Non, les recettes des légumes."?