Some ideas for making donuts:
- https://www.seriouseats.com/recipes/2012/01/chocolate-cake-doughnuts--make-at-home-recipe.html
- https://sweets.seriouseats.com/2012/01/sweet-technique-how-to-make-doughnuts-donuts-at-home-instructions.html
- https://www.seriouseats.com/recipes/2012/01/yeast-raised-doughnuts-make-at-home-glazed-recipe.html
- https://www.bonappetit.com/type/doughnut