If you ask a local about their traditions, Churros and Chupitos would be two of the more popular answers.

Churros are fried dough pastry based snacks, sometimes made from potato dough. The snack gets its name from its shape, which resembles the horns of the Churro breed of sheepreared in Spanish grasslands.
The Churro Cafes (Churrerias) in Barcelona
- Granja Xocolateria La Pallaresa. This old fashioned chocolateria serves the extremely tasty churros with chocolate. The thick rich chocolate is perfect for dipping and not too sweet. The atmosphere is casual and comfortable.
- Cafe de la Opera. The cafe dates back to 1850 and was typically a place where people used to go before or after opera. The name comes from the Liceu Opera House, located directly across La Rambla, and once upon a time patrons would have gathered here for a pre-performance aperitif. Although it has been renovated over the years, the interior still retains Belle Epoque details. It's a great place to pull up with a book during its quieter daytime moments. The Churros are delicious.
- Cafe de la Opera Info: La Rambla 74, Metro Stop (Parada) - Liceu
Chupito translates into English as shot. Locals and many internationals come to these bars to start off the night with 100s of different types of Chupitos. You may try all colors, flaming, sweet, sour Chupitos with real interesting names.
The Chupito Bars (Chupiteria) in Barcelona
- Espit Chupito is by far the most well-known Chupiteria of Barcelona. There are over 580 varieties of Chupitos. It opens at 8pm and closes at 2:30am. The most favorite chupitos are Monica Lewinsky and General.
Espit Chupito Info: Calle Aribau 77