Add an anosmia status condition, in which you have no sense of smell:

• Tins cannot be identified by their smell, unless they contain spinach or are empty.
• Messages involving smell, such as when you cast stone to flesh on rocks, are suppressed.
• Food detection scrolls and the spell of detect food don’t work.
• Food appraisal doesn’t work.

Not specified what things in the game might cause this condition, or if it should be a roleplay birth option.

Random tins can contain beans as their contents, which make you emit a stinking cloud when or after eating them.

Shopkeepers in delicatessens who are sold corpses should magically turn the corpses into tins of that monster with a random beatitude. As well, delicatessen shopkeepers rarely generate carrying a tinning kit.

Becoming hungry or weak does not interrupt opening a tin, though it continues to interrupt all other occupations.

Piranhabane, an artifact rod that instakills piranhas (and possibly, turns them into tins of piranha meat in your inventory or at least out of the water).

Beverage tins, which contain a potion instead of meat from a monster. Randomly generated ones always have potions with the “bubbly”, “fizzy” or “effervescent” appearance.

When you eat such a tin, it “opens with a loud hiss!”, making noise in some radius. It always takes 1 turn to open regardless of beatitude. Then you are shown its appearance. If you are not blind, you see it directly (“It contains a bubbly liquid”); if you are blind but have identified the potion, you recognize the potion by the smell; otherwise you get a generic “It feels like some liquid is inside”. Then you’re prompted to drink it, like with any other tin. If you do, you experience the same effects as you would from a potion of the corresponding beatitude.

Tinning kits could possibly convert potions into homemade beverage tins, but there needs to be some sort of downside which hasn’t yet been proposed. As it stands, you would be able to convert a 20-weight potion into a 10-weight unbreakable potion. The existing downsides are that it expends a tinning kit charge and the resulting potion can’t be dipped, alchemized with, or thrown, but for the sort of potions one would want to turn into tins, these aren’t really downsides.

Probing will reveal the contents of tins it hits (and mark the tins as identified so they stay revealed).

Blessed tinning kits have a chance of creating multiple tins from large, high-nutrition monsters. Specifically:

• If the monster’s corpse is 800 or less nutrition (the amount from a food ration), it always makes 1 tin.
• If the monster’s corpse is greater than 800 nutrition, it produces NUTR / 800 tins, plus possibly one more with a (NUTR % 800) / 800 chance. (So a monster whose corpse is 2000 nutrition would always produce 2 tins with a 50% chance of a third.)
• It expends a charge for each tin produced like normal. If it would make more tins than there were charges, the amount of tins is capped at the number of charges.

Pet cats lose 2 tameness when the player wakes them up. However, opening a tin wakes all nearby felines, and this will not cause cats to lose tameness when woken.

Tins dropped by / generated with hobbits are biased towards high-nutrition preparation methods. Additionally, there can be some high-nutrition preparation methods which only appear on hobbit tins: “wild mushroom foo”, “second breakfast of foo”, “foo for elevenses”, “luncheon foo”, “foo tart”, “foo porridge”, “foo stew”. If hobbit is a playable race, they are capable of making these tins with a tinning kit in addition to the regular “homemade”. And possibly an artifact tinning kit that allows anyone to produce hobbit-style tins.

When opening a tin with a tin opener, the beatitude of the tin opener is added to the tin similar to how markers and scrolls work (e.g. a blessed tin opener opening an uncursed tin will treat it like a blessed tin).

Tins of “pureed monster” or “soup made from monster” do not break foodless conduct. Possibly change tin behavior so the preparation method can be discerned before eating it, or just display the preparation when the tin is opened, e.g. “You succeed in opening the tin. It contains a puree that smells like newts. Eat it?” This doesn’t have to reveal every preparation method, so that greasy fried food remains a danger.

Add “gourmet” as a random tin preparation type, giving 350 nutrition. Also add “stale” as a tin preparation type, giving 100 nutrition.

Tins that don’t contain monster meat can contain either spinach or spam.

You can read the label on tins. All player-made tins are unlabeled, while random tins will randomly (and deterministically) either say truly what sort of monster is in them, or have an irrelevant message. Messages could include: “Tuna Fish - expires Feb 6, 1989”, “Rare Meat of a Genocided [hallucinatory monster]”, “Water Chestnuts - be sure to eat while underwater”, “Yendorian Brand Applesauce”, “This Tin Is Not Booby-Trapped”, “Fresh Tinned Adventurer Meat”.

Tinning huge corpses produces the tin as usual, but just makes the corpse partially eaten instead of destroying it.

Add fruit in tins as an alternative to spinach or corpses.

Tinning the corpse of a named creature transfers the name to the tin.

You have a lower chance of genociding monsters, wishing for items, and identifying canned food if you have never seen the monster or item in question.

Hitting a tin of long worm or purple worm meat with an undead turning beam turns it into a can of worms, which when you apply or eat it creates a bunch of random w around you. Cans of worms can also be found randomly generated.

Homemade tins give the minimum of the corpse’s nutrition and 50 nutrition. This is to prevent silliness like a killer bee corpse giving 5 nutrition when eaten but magically giving 50 after being tinned.

Tinning kits include tin openers implicitly, so if you wield it you can open tins.

The preparation method of tins should be deterministic, so that tins that stack together will have the same method.