Edition 17-Tomato Paste
Tomato paste is a thick tomato product often found in small cans or tubes. It can be added to the back of a sauce to give a hint of tomato flavor, or as a base to start making something as awesome as spaghetti or pizza sauce. If you have a recipe that calls for tomato sauce, you can simply add tomato paste and water to equal the sauce.
(I had already posted this as a bonus for Fun Monday).