Most so-known as truffle oil available in outlets does not include truffles at all but is produced synthetically to replicate (to a point!) the unique odour of real truffles. Spots which have borne truffles this season are marked with multicolored landscaping flags. 8. It takes approx 20-30 min to have the rice all cooked using the strategy in 7 above. Note, the walk as much as the fortress takes about 15 minutes. Nowadays, Carpentras is a commercial center for Comtat Venaissin and is well-known for the black truffle market that takes place each Friday morning through the winter months.