Perhaps you mean 'Meal' vendor, which looks like this? In that case, the Kitchen vendor sells kitchen tools, like blenders etc. whilst the Meal vendor sells ready-cooked foodstuffs.
Nope. I mean "Cooking."
There are two in Bortola. Mien Evoke and Pikku Precedent.
They aren't meal vendors. When I checked, it appeared they were very similar to Kitchen Tool vendors, if not exactly like them.
In terms of things they sell, I also wondered about these cooking vendors and can confirm they sell the same things as a kitchen tool vendor. Well they did when I last checked and compared. I didn't check if the buying prices were the same.
In terms of selling stuff to them...ore from mining etc. to make currants, these cooking vendors seriously short-change you compared to other vendors - don't do it!! I haven't actually compared selling at a kitchen tool vendor to see if they short-change you in the same way...but if you are mining for currants, cooking vendors are not the way to go.
I was SO excited to see "Cooking Vendor" in Bortola, because that's what the meal vendor in the mines is listed as. But they seem to be the same as kitchen tool vendors :(