black truffles that are farmed, not foraged. are. >> 30 or so years ago, not many people had heard of this umbrian ingredient, but now carlo can barely keep up with the demand and neither can mother nature so he's come up with a solution. >> to create the ideal conditions for truffles to grow, carlo has a special technique for treating each acorn he plants. you take the nut, a little bit of the truffle. >> and a little piece of black with the truffle. we mix together. >> with this. >> and we wait for one year and