The Listeroid engine, here built into a very nice genset. This engine runs great on everything from veggie to motor oil and tranny fluid! The builder of this Lister-Genset claims that it burns only gallon per hour watts.
Cooking Techniques - While it's possible to argue that cooking is cooking, there are some techniques and tips that make cooking in a boat galley easier. lots of crock pot recipes I need to save I guess.