Sentence:  When Seu Mariano was occupied, I could count on my next-door neighbor, Manuel Roberto, to tell me about the days when he traveled through the surrounding hills selling the pungent oil of the <WSD>pequi</WSD> nut (prized for the distinctive flavor it gives to an otherwise dry and largely tasteless mixture of rice and beans). 
Meaning of the word marked with <WSD> tags:  The fruit of such trees, pequi nut.