Recently as I was trying different items from the dangerous and forbidden purple fez I came across a bad bottle of Tuaca. It had the taste of dirt. So now I know Tuaca does have a shelf life of 3 or 4 months depending on the cork. Beware. Do not mix drinks with it unless you can smell the vanilla!
Tuaca is like a tasty little treat in a bottle. It's an Italian liqueur with a vanilla taste with a little hint of orange and it's great in a vanilla martini.