Abstract: Berber subclassification is notoriously problematic, due to overlapping innovations and retentions across hypothesized subranches. Focussing on Oriental Berber, we analyze the lexicon of food, on the assumption that linguistic contacts within Berber and between Berber and Arabic are reflected in material and immaterial culture. An original method for the analysis of food terms and their denotations is proposed. We illustrate it through a case-study, a food preparation, whose various denominations are cognates of the stem *βazin, and which confirms most linguistic hypotheses about subgroupings and contacts, additionally exemplifying a case of levelling due to borrowing into Arabic followed by re-borrowing into Berber. It also points to further contacts across Berber language groups (best analyzed in terms of linkage), and confirms the relevance of the study of food culture in support of the historical reconstruction of Berber languages.