Potato – la patata
(Pronounced pah-tah-tah)
To remember that potato is pronounced pah-tah-tah (patata) in Spanish, use the following mnemonic:
His new diet forbade him eating potatoes, so pa said ta-ta (patata) to them.

Patata is feminine, so it's la patata. Imagine a potato that looks like a lady:

Examples of patata (potato) in a sentence
Me gustan las patatas fritas con ketchup.
(I like potato chips with ketchup.)
¿Puedes pelar las patatas para la cena?
(Can you peel the potatoes for dinner?)
La sopa de patata está muy caliente.
(The potato soup is very hot.)