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. 

Costrada is a traditional dessert originating from Alcalá de Henares. This classic dessert consists of sheets of puff pastry that are filled with pastry cream and meringue. The whole thing is topped with chopped almonds and icing sugar, then baked for a short while in order to roast the almonds and dry the outer meringue.

Costrada was first made by two famous local confectioneries called Salinas and El Postre, but both of them are closed now. This dessert can be found in most of the city's restaurants. Before serving, it should be well-chilled, and when served, it's best to accompany the pastry by a cup of coffee on the side.