Areias (<small>singular</small>: areia, ) are small traditional Portuguese pastries similar to cakes and biscuits. They are commonly coated with coarse-grain sugar ("sanding sugar"), and sometimes cinnamon, which resemble sand for which areias are named after.
Areias de Cascais () or simply areias. The traditional recipe calls for dough made of flour mixed with lard (or butter), rolled into balls the size of walnuts, that is baked without the use of a leavening agent. The biscuits are then coated in coarse-grain sugar. Some modern recipes optionally use lemon zest or vanilla, or incorporate ground almonds and glacé cherries. Because of the simplicity of recipe, variations exists throughout Portugal.
Areias Brancas () are moist flourless cakes containing finely ground almonds, egg yolks, and sugar. Unlike other areias which are formed like cookie dough, this cake is made with a batter that are baked into small individual molds. After baking, the cakes topped with sanding sugar.
The original unnamed cake recipe is believed to be derived from a conventual sweet created in Lisbon. When the over two-century year old cake recipe was taken out from the convent to Lourinhã, it was named after the nearby beach Praia da Areia Branca. This traditional product is now a trademarked product made solely by a single family bakery, Casa das Areias Brancas. In recent years, the bakery has also incorporated aguardente as an ingredient.
In 2016, it was featured at the Cannes Lions International Festival of Creativity in a video entitled "The Most Famous Unknown Cake".