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僕のような西の人間が、「はんぺん」という食材に馴染みがない証拠は…
→ “Proof that a Westerner like me isn't familiar with an ingredient called 'hanpen' is...”
僕 boku = I (male, humble pronoun) (pronoun)
の no = (possessive particle indicating 'of') (particle)
ような yōn¹a = like / similar to (adnominal modifier) (adverb/adjective)
よう yō¹ = appearance / manner
な na = connective form of na-adjective
西 nishi = West (noun)
の no = (possessive particle indicating 'of') (particle)
人間 ningen = human / person (noun)
が ga = subject marker particle (particle)
「 = [opening quotation mark] (punctuation)
はんぺん hanpen = hanpen (fish cake) (noun)
」 = [closing quotation mark] (punctuation)
と to = quote particle / saying (particle)
いう iu = to say / call (verb)
食材 shokuzai = ingredient / foodstuff (noun)
に ni = target particle for familiarity (particle)
馴染み najimi = familiarity / habit (noun)
が ga = subject marker particle (particle)
ない nai = not present / not having (negative adjective)
証拠 shō¹ko = evidence / proof (noun)
は wa = topic marker particle (particle)
… = [ellipsis] (punctuation)