There has been discussion on this forum about Cauldrons and Cooking, but there's no real rule for cooking food without Chef talent (at least I couldn't find it), so here's my suggestion.
The cooking rule works as described in the Chef talent, but instead of automatically succeeding at creating D6 units of Food, player has to roll their Survival skill (So Wits base dice, skill dice and possible gear dice e.g from cauldron) and produces 1 Unit of food for every 6 rolled. For every 1 rolled, one unit of Vegetables, Meat or Fish goes to waste.
I don't know how pushing such roll would work, as losing Wits for burning one's food sounds a bit silly. Then again, if hits and misses would cancel each other out, ending up with more misses means that one just spent a quarter of day and destroyed a whole bunch of precious food: That may be hard for one's self-esteem.
So what do you think?