Bocadillo de sardinas is a humble Spanish sandwich with a savory filling of canned sardines. The sandwich is usually made with a Spanish-style baguette (barra de pan), although other types of bread may also be used such as ciabatta bread or wholemeal bread.

After it’s been sliced lengthwise, the bread is topped with sardines which can be preserved in oil, tomato sauce, or vinegar, thus imbuing the sandwich with additional flavor. The filling may be enhanced with various other ingredients such as peppers, tomatoes, cilantro, lettuce, onions, avocados, olives, boiled eggs, mayonnaise, mustard, yogurt sauce, mushrooms, sautéed vegetables, and olive oil.

This sandwich is usually eaten for lunch or dinner, although it also makes for a healthy afternoon snack.