Concha

As the soft bread rises, the lines in the sweet crust laid over the top open up, and a seashell pattern appears. The Mexican concha is a sweet bread made from two separately prepared parts: a yeast-risen bread and a topping of sugar, fat and flour. Its name, meaning “shell” in Spanish, comes from this surface pattern. When lines are cut only into the topping crust, without cutting the bread dough beneath, the shell pattern opens up during baking.

Fermenting a softly kneaded dough

The base is a dough kneaded from wheat flour, yeast, sugar, eggs, butter and other ingredients. Some formulas use milk, and others are made with water. The dough is worked from a soft, slightly sticky state into a smooth, elastic one, then left until it has risen sufficiently. It is divided, rounded and shaped into gentle domes to hold the topping crust.

Adding too much flour to get rid of the stickiness also tends to make the baked crumb hard. Kneading the soft dough thoroughly and letting fermentation fill it with air are what give the bread its texture. Because the amount of liquid the flour absorbs varies with its properties, the moisture is adjusted while checking the condition of the dough.

Some methods use a preferment, in which part of the flour, water and yeast is mixed in advance and left to rest. This is a technique to make the dough easier to knead and shape, not a step essential to conchas. The bread beneath can also be made in different ways, such as formulas that bring out a rich milk flavor and formulas that make the most of the flour’s flavor and a light chew.

Cross-section of a concha. A sweet crust covers the white bread. Photo: Smeet666, 2008-12, location unknown. Original image / CC BY-SA 3.0. Reduced-size version from the distributing source. Any processing at the time of original publication is unknown; no further processing was added here.

Scoring the pattern only into the sweet top crust

The topping is a paste made by mixing sugar into softened shortening or butter and then adding flour. Powdered sugar gives a finish that melts away in the mouth, while granulated sugar leaves a light crunch from its grains. The paste is rolled into thin rounds, one per bun, and one round is placed on each shaped bun. In some methods, the base is brushed thinly with fat or egg white so that the crust adheres.

The shell lines are made with a dedicated pattern cutter or a knife. Only the topping is divided, without cutting deeply into the bread below. In some methods, the pattern is scored before the final proof; in others, the lines are cut after proofing, just before baking. Either way, as the bread rises, gaps open between the sections of crust, revealing the colored surface and the grooves.

White crusts are typical, but there are also brown crusts mixed with cocoa, as well as pink and other colors. Beyond color, the thickness of the crust and the choice of fat and sugar change how it bites and how it melts in the mouth.

Differences in size and name, and the related chilindrina

The concha is one of Mexico’s many varied sweet breads, known as pan dulce. Besides regular-sized ones, there are small conchitas for breakfast baskets, as well as large ones. In the Sotavento region of Veracruz, it is also known as bomba.

The related chilindrina is a sweet bread with a thick orange or yellow topping, baked without scored shell lines. Fermentation and baking create natural cracks, and some versions are finished with a scattering of coarse sugar. Even with a similar bread base, a different way of making the top leads to a different name.

Green, brown and white conchas at a festival in Sonoma, U.S. The toppings bear a variety of lines. Photo: Sarah Stierch (CC BY 4.0), 2024-05-05, Sonoma, California, U.S. Original image. Reduced-size version from the distributing source. Any processing at the time of original publication is unknown; no further processing was added here.

Flour and flavor innovations by bakers in the U.S.

Among Mexican American bakers in the United States, approaches have also emerged that use whole wheat flour, stone-ground flour and unrefined cane sugar, and that color and flavor the crust with fruit, flowers and spices. The concha is also a sweet that carries on the bread of home while taking on new ingredients and forms of expression.

Memories of a sweet bread that crossed the Pacific

Bakeries in Hong Kong sell the “Mexico bun (墨西哥包),” a bread covered with a sweet crust. The Hong Kong culture magazine Zolima CityMag relates the story that the Ng family, Chinese people driven out of Mexico, opened a shop in Hong Kong in 1946 and made this bread out of longing for the concha. A Chinese Mexican historian interviewed by the magazine said that the bread’s origin has not yet been confirmed. The Mexico bun is spoken of as a food memory linked to the concha, but how it came to Hong Kong has still not been established.

Mexico’s wheat bread culture and the emergence of the concha

Wheat bread, which spread during the colonial period, later mingled with European-style sweet breads and gave rise to many forms in Mexican bakeries. It is not known when, or at which bakery, the concha’s structure of a yeast bread topped with a sugar crust became established with the shell pattern.

Choosing at the bakery and eating with drinks and fillings

In the morning and evening, panaderías display sweet breads with all kinds of patterns. Customers pick up a metal tray and tongs and choose the breads they like. Conchas are eaten as they are, and they are also enjoyed by dunking them in coffee, milk or hot chocolate, a way of eating called chopear. As the bread soaks up the liquid, the sweetness of the sugar topping blends into it.

In Veracruz, there is a custom of eating them with warm bean paste. Some are filled with nata, the thick layer collected when milk is heated, and others are made into ice cream sandwiches. Pastry chef Fany Gerson has also introduced these local ways of eating and has herself combined conchas with frozen desserts. The richness of dairy or the saltiness of a filling joins the sweet topping and the mild-flavored bread.

A family table in the state of Oaxaca. Conchas are set out with tamales and hot chocolate. Photo: AlejandroLinaresGarcia, 2014-09-15, Santa María Atzompa, Oaxaca, Mexico. Original image / CC BY-SA 4.0. Reduced-size version from the distributing source. Any processing at the time of original publication is unknown; no further processing was added here.

Conchas served with warm milk at a café in Veracruz. Photo: AlejandroLinaresGarcia, 2010-01-31, Veracruz, Mexico. Original image / CC BY-SA 4.0. Reduced-size version from the distributing source. Any processing at the time of original publication is unknown; no further processing was added here.

Glossary