Can confirm you can also mix and match individual ingredients. For instance this worked using 3x Wolf Meat & 3x Pork Meat in one individual cook.

it can be done with 2 dried fishes.

Dried fish can be stacked

Fish can be replaced with 2 dried fish

Above is NOT true, you can still fail using 5 meat at master 2 level.

6 meat + 1 dried fish + 3 mineral water + 4 flour
724 batches 100% success @ guru 14

1844 batches also 100% success

Cannot sub flour with Freekeh Flour.

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

Can confirm that 2 dried fish, 3 meat, 3 mineral water, and 4 potato flour does NOT work at Master 19.

EDIT: 5 meat does not work either.

после мастер 5 достаточно
3 Мясо
1 Сушёная рыба
3 Вода для готовки
4 Мука

able to do it with
1 dry fish
3 water
3 potato flour
3 lamb meat
100% success
at master 1

3 meat , 1 dry fish , 3 water , 3 potato flour

Does it work at Master 5 in 2019?