Can of Beans

Eat it on the road and keep the tin. The beans are a small boost to health, hunger and thirst by the game's own text, enough to keep a fresh spawn walking but nothing you plan a day around. The part newcomers throw away is what stays behind: an empty can of beans sitting in your inventory.

Picture the first evening of a wipe. You clear the barrels along a road, pull two cans out of a crate, eat both and head on to the next monument. Back home, those empty tins go into the furnace beside your ore and come out as metal fragments. A few frags is not much, but early on it can be the last handful you were missing for a tool.

The can of tuna works the same way, except its empty tin has a second life as a lamp. Bean cans only ever turn into frags, so smelt every one of them and never drop one on the floor.