Decouple sandwich-prep & meat-cooking

This reduces the skill & time needed for sandwich-prep, removes the heat
requirement (but not the cutting), calls for cooked meat rather than
raw, and makes the meat/cannibal sandwiches reversible since there's no
reason you couldn't take the meat off the bread and eat them separately.
Merge pull request #7926 from KA101/steaksandwich

Decouple sandwich-prep & meat-cooking