Breakdown of La tostada se quemó por un lado.
Questions & Answers about La tostada se quemó por un lado.
In Spain, la tostada usually means a slice of toasted bread / toast, especially the kind you might eat for breakfast.
So in this sentence, la tostada is most naturally understood as the piece of toast.
A learner from the US might think of a tostada as the Mexican dish with a crispy tortilla, but that is not the usual meaning here.
Spanish often uses the definite article more than English does.
Here, la tostada refers to the specific piece of toast being talked about. Even if English might just say Toast burned on one side, Spanish commonly prefers La tostada...