Gat Kimchi — Mustard Leaf Kimchi (갓김치)

Jeolla-do, South Korea — particularly Yeosu and Gwangyang-gun; the region's maritime climate and specific gat cultivar are inseparable from the dish's identity

Gat kimchi uses gat (갓, Brassica juncea var. integrifolia), the broad, dark-green mustard leaf grown extensively in Jeolla province, particularly around Yeosu and Gwangyang. The leaf's natural mustard compounds create a distinctive peppery bitterness that intensifies dramatically during fermentation, transforming into a complex, almost wasabi-like heat layered beneath the gochugaru. Yeosu gat kimchi is considered the benchmark; the maritime microclimate and specific variety grown there produce a distinctive mineral quality from the sea air. Fully fermented gat kimchi is one of Korea's most potent fermented side dishes.

The aggressive pungency of gat kimchi pairs with fatty, rich proteins where it functions as a digestive enzyme — ganjang-gejang (soy-marinated crab), grilled eel, or oily mackerel. It is the kimchi that completes a Jeolla-style han-sang (전라도 한상), the most celebrated banchan tradition in Korea.