We'd never heard of this before, but apparently it's a fairly widespread phenomenon referred to as "pine mouth." Eat the wrong batch of pine nuts and you'll taste a phantom bitter or soapy off-flavor in all your foods and beverages. It can last anywhere from a few days to a few weeks, but doesn't seem to have any harmful health effects - other than making food taste wrong, of course.
The kicker is that no one seems to know how or why this happens. And why it happens with some pine nuts and not others. Some people point a finger at Chinese pine nuts, a particular variety of pine nut with a higher oil content (according to On Food and Cooking), but there's no actual evidence supporting this. It's also possible that the funky pine nuts are old or have oxidized, but again, research has been inconclusive.
It's also doesn't seem to be caused by any of the following: food allergies, heavy metals, pesticides, or fungal contamination. Good to know!
While we aren't exactly thrilled to be rolling the dice every time we eat pine nuts, we also aren't likely to stop eating them any time soon! Hopefully a research scientist will take pity on all of us poor pine nut lovers and figure out the mystery.
Here are a few more stories about "pine mouth":
• Pine Nut Syndrome on David Lebovitz
• Taste Disturbances after Pine Nut Consumption (abstract) from the European Journal of Emergency Medicine
• Pine Mouth Revisited on Epicurious
• Pine Mouth Puzzle on Mail Online
Do you have a pine nut horror story to share?