I want to build a world that satirizes the modern cult of cooking. The cult has a long list of infractions that will ruin a dish and render it inedible. For example:
Chopping an onion the wrong way
Holding the knife the wrong way
Using table salt instead of kosher salt
Measuring dry ingredients by weight rather than by volume
Measuring dry ingredients by volume rather than by weight
Not frying onions before adding to stew
Confusing unflavoured with "vanilla" ice cream
Boiling pasta beyond "al dente"
Slicing meat along the grain
Making pesto using a food processor rather than a mortar and pestle
Adding cream to carbonara
Pouring milk in the cup before the tea
Pouring tea in the cup before milk
Thick based pizza
Not salting Pasta Water
Boiling and washing rice rather than using the absorption method
Holding chopped ingredients between the knife blade and your other hand.
Cooking meat by time rather than internal temperature
In reality some of these mistakes have the potential to ruin a dish. For example if you modify a pizza recipe with a thicker base, you must also modify the recipe to cook longer. Other mistakes simply give a different product which you might or might not prefer, rather then rendering the dish inedible.
The cult is not appeased by reason however. With a flourish they declare your creation is no longer a pizza and should be destroyed before the Neapolitans find out and declare war (again).
Note: when I say the wrong way I don't have a correct way in mind. The point is there are several proposed correct ways and they all conflict with each other while claiming to be the single truth.
I want to build a world that parodies all the misconceptions of cooking culture by pretending the misconceptions are all facts. In this world cooking is extremely sensitive. Cutting an onion wrong will make it poisonous and overboiling pasta will not simply change the dish, but render it inedible.
What is the minimum change required to the universe to make the above possible? I would like the change to be small relative to the number of rules that it makes true.