Morcilla de Burgos are blood sausages that are traditionally made in the province of Burgos. This is one of the many varieties of blood sausage, or black pudding, present all around the world. The recipe for this delicacy is fairly simple and uses only a few humble ingredients.

An interesting fact about this recipe is that it doesn't actually involve any meat, since morcilla de Burgos is made by chopping and sautéing the onions with butter, then combining them with rice, lard, blood, and spices. The mixture is then used to fill the sausage casings before being cooked. 

Lechazo is a Spanish dish consisting of a roasted suckling lamb. In order for the lamb to classify as lechazo, it must weigh between 5 and 7 kg and its age cannot be more than 20 to 30 days. The lamb must be fed only on its mother's milk, hence the name lechazo, derived from the word leche, meaning milk.

Today, numerous restaurants in Spain specialize in lechazo, where they roast the lambs in traditional wooden stoves known as hornos de leña.

Rosquillas are traditional Spanish deep-fried donuts, characterized by their fluffy texture and a hole in the middle. They are typically prepared during the Holy Week festivities. Although there are many varieties of rosquillas, the classic ones are prepared with a combination of eggs, sugar, milk, oil, lemon zest, flour, baking powder, and anisette, which imparts a unique flavor to these tasty donuts.

Another classic variety of rosquillas is made with sweet muscat wine (moscatel), and those donuts are known as rosquillas de vino. After they have been deep-fried, rosquillas are typically served as a sweet snack, topped with cinnamon sugar. 

Bocadillos or bocatas are Spanish sandwiches made with Spanish-style baguettes known as barra de pan, unlike regular sandwiches which are made with modern white bread, known as pan de molde in Spain. The most common fillings for bocadillos include meat, cheese, tuna, omelets, jamón, or chorizo sausages.

The Spanish typically don't add onions, mayonnaise, pickles, or lettuce to bocadillos, but the bread is sometimes rubbed with halved tomatoes or olive oil. Due to the popularity of these sandwiches, the fillings vary from one region to another – omelet bocadillos are usually eaten for breakfast or as an afternoon snack and include eggs, cheese, beans, peppers, and potatoes; meat-based bocadillos are often made with chicken, beef, pork, horse, or goat; and fish bocadillos often include cuttlefish, sardines, and squid. 

Bizcocho de aceite is a traditional sponge cake. It's made with a combination of eggs, milk, sugar, flour, olive oil, and baking powder. The cake batter is typically enriched with lemon zest, then poured into a shallow tray and baked until golden brown.

This olive oil-flavored sponge cake is cut into smaller pieces and dusted with icing sugar before it's served.