What's the one food item/ingredient you will always make yourself?

Over the last year or so I have decided to make more and more ingredients/dishes at home instead of buying them from a store/restaurant. Everything ranging from stocks, fats, pasta, pizza, all the way to something as silly as croutons, I have found all of it to be a lot more tasty if I make it myself.

So, what's one dish/ingredient that you made and will never buy at the store again?