For my 20% project, I'd like to brew beer. As someone who enjoys and regularly consumes, I'd like to brew my own. I've done some fermentation cooking before -- yogurt, kimchi, sauerkraut, pickles -- and I think I'm ready to handle the challenge of making beer. It will require time, research, and input from my PLN. One requirement of this project is to have a failure as a realistic option, and there certainly is a high rate of failure with first-time homebrewers.
Alternatively, I'd like to learn to make sushi. I'm interested in both. If anyone has any suggestions for these projects, or thoughts on which'd be better, let me know in the comments.