pepper – la pimienta
To remember that pepper is pronounced pee-mee-ehn-tah (pimienta) in Spanish, use the following mnemonic:
I was buying some pepper and the pepper made me sneeze. I suddenly wanted a pee, but they wouldn't let me enter (pimienta).
Pimienta is feminine, so it's la pimienta. Imagine a lady being sprinkled with pepper.