What is the proper way to pronounce relleno?

The proper pronunciation of "relleno" depends on whether you're referring to the Spanish word or the English adaptation:

Spanish:

* re-YENO (emphasis on the second syllable)

English:

* re-LEN-oh (emphasis on the second syllable, with the "o" sound like the "o" in "go")

Context:

* In Spanish: "relleno" is a common word meaning "filling" or "stuffing".

* In English: "relleno" is often used to refer to a dish, usually a stuffed pepper, in Mexican cuisine.

Therefore, the pronunciation will vary depending on the context.