Thid is a pecan. Two halves actually. Some people call the Peh-Kahns'. But in the South, where I hail from, people call them Pee'-cans.
People down South also make a lot of different desserts with them. Such as pee'-can pralines, pee'-can pie, pee'-can logs, butter pee'-can ice cream, sugar frosted pee'-cans, chocolate coated pee'-cans, etc., etc.
The pee'-can is really good for you by itself. That's the best way to enjoy them. Lots of protein & good fats. Tasty too!