Dear me, I shouldn't have brought it up before lunch... I hope there is something vegetarian on the menu today...
Amputations are legal and not that rare, so there are some means.. Hhere's a relevant example of a part of a leg begin eaten - https://www.reddit.com/r/IAmA/comments/8p5xlj/hi_all_i_am_a_...
technically when hansel and gretel checked into their airbnb in the forest, they consented to being shoved into an oven if they spilled breadcrumbs. It was all in the contract.
I don’t know, seems like that leaves some loopholes, you just have to get pre-death approval ;)
> (1) Whoever unauthorizedly takes away from the custody of the entitled person the body or parts of the body of a deceased person, a dead corporeal fruit, parts of such or the ashes of a deceased person, or whoever commits insulting mischief thereon, shall be punished by imprisonment for not more than three years or a fine.
translated from https://www.gesetze-im-internet.de/stgb/__168.html
I was thinking more of the situation of a person who’ll soon die (but is mentally capable) gives permission to be eaten after their death. Sittenwidrig would be another issue, I agree.