Beginning with the Feast of the Immaculate Conception (December 8), one gives the tió a little bit to "eat" every night and usually covers him with a little blanket so that he will not be cold at night.
On Christmas day or, depending on the particular household, on Christmas Eve, one puts the tió partly into the fireplace and orders it to "poop" (the fire part of this tradition is no longer as widespread as it once was, since many modern homes do not have a fireplace). To make him "poop", one beats him with sticks, while singing various songs of Tió de Nadal.
The tió does not drop larger objects, as those are brought by the Three Wise Men. It does leave candies, nuts and torrons. Depending on the part of Catalonia, it may also give out dried figs. When nothing is left to "poop", it drops a salt herring, a head of garlic, an onion or "urinates". What comes out of the tió is a communal rather than individual gift, shared by everyone present.
The Catalans have a great sense of humor :)