This study aims to demonstrate that the lexical repertoires of the Proyecto de la norma culta hispánica “Juan M. Lope Blanch” are a fundamental resource for the teaching of linguistic variation within the framework of the “specific notions” established by the Plan curricular del Instituto Cervantes (PCIC), and, by extension, for the teaching of Spanish as a foreign language. As a case study, we focus on the semantic field of food—specifically, lexical items related to legumes—in order to illustrate how these lexicons can contribute to expanding the lexical inventory associated with the PCIC’s specific notions. More importantly, this expansion should reflect the full linguistic diversity of the Spanish-speaking world, taking into account widespread forms (panhispanicisms), regionally specific terms used in Latin America (Americanisms), and those exclusive to Spain (Spanishisms). Moreover, since this lexicon stems from the educated urban norm, it is particularly suitable for integration into ELE classrooms, ensuring both communicative relevance and pedagogical coherence.