Another option is to heat up a soldering iron and an iron, and while they are heating up, dip your neighbor in a barrel of rainwater until he tells you the recipe... if a bath doesn't help...:)
You order similar cookies from a bakery, treat your neighbor and say that you made the exact same cookies as him. He tries them, starts arguing and tells you the full recipe :)
Another option is to heat up a soldering iron and an iron, and while they are heating up, dip your neighbor in a barrel of rainwater until he tells you the recipe... if a bath doesn't help...:)
You order similar cookies from a bakery, treat your neighbor and say that you made the exact same cookies as him. He tries them, starts arguing and tells you the full recipe :)
Similar? Mission impossible.
Then... either remember the 90s, or suggest he publish the recipe in inleo :)