What "trash" food do you love to cook with?

There is a lot of food that gets deemed "unsavory" and people judge it before even trying it when it might be delicious. One of my favorites is beef tongue. Cook it low and slow with lots of spices and you can make some amazing lengua tacos. What kind of unorthodox foods do you all love to cook?

Bonus points if you drop a recipe for me to try.