Pintxos are a type of Basque tapas that have become popular in Barcelona. They are small bites served on a skewer or toothpick, typically consisting of a piece of bread topped with various ingredients such as cured meats, cheeses, seafood, or vegetables. Pintxos are often displayed on the counter of bars, and you can choose the ones you like and pay based on the number of toothpicks you have. It's a fun and interactive way to try different flavors and combinations.