Which hop variety is known for conveying an onion aroma?

Summit hops are known for their distinctive aroma characteristics, which can include onion-like, garlic, and herbal notes. This unique profile is why Summit is often used in certain styles where these aromas complement the overall flavor of the beer, such as IPAs and other hop-forward styles. The onion aroma can be attributed to specific compounds present in the hop, particularly thiols and certain sulfur-containing compounds.

In contrast, the other hop varieties mentioned have different flavor and aroma profiles. Centennial is often characterized by a balanced mix of floral, citrus, and earthy notes; Cascade is renowned for its floral, grapefruit, and citrus characteristics; Zythos is a blend of various hops and tends to reflect a more generalized hop aroma rather than any specific flavor such as onion. Therefore, Summit stands out due to its ability to convey that specific onion aroma.