had ever really heard of this umbrian ingredient but now carlo can barely keep up with the demand and neither can mother nature. he has come up with a solution. [speaking foreign language]. >> 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. >>en a a piece of a black winter truffle piece we mix together. >> with this. >> put in the umbaso and wait for one year and put in the ground. [speaking foreign language]. >> we put inside the ground. >> a year in the pot, in the ground it goes. five years of umbrian sunshine and some rain and there you are. truffles on top.