What is the top of a concha made of?

A concha consists of two parts, a sweetened bread roll, and a crunchy topping (composed of sugar, butter and flour). Their distinctive pattern is made by pressing a bread stamp (cf Butter stamp) over the topping while the dough is proofing.

What flavor is the yellow concha?

Conchas are a soft and sweet Mexican bread with a white topping that resembles the surface of a seashell. This is where the concha gets its name, since “concha” means “shell” in Spanish. The classic color of the topping is white, but it can also be pink, yellow, or brown (which is chocolate flavored).