Sefardim have a seder for Tu Bishvat that is done before dinner on that night, kind of like the yehi ratzon “seder” that is done on Rosh Hashana. They try to get 100 different types of fruits/nuts/wines, at least one of each of the shivat haminim, and at least one that would be shehecheyanu. They go around the table with everyone saying brachos on the shivat haminim and then eat the rest of the foods.
Btw, on Tu Bishvat one should daven to find a good esrog for the upcoming sukkos.