Japan-wide — summer barley tea tradition dating to Edo period
Mugicha (麦茶, roasted barley tea) is Japan's signature summer cold beverage — an unsweetened, caffeine-free infusion of roasted barley that produces a distinctly toasty, slightly bitter, refreshing cold drink consumed by all ages from summer to autumn. It is served in clear jugs in virtually every Japanese home and many restaurants during summer, replacing hot beverages. The flavour is nutty-roasted with a slight pleasant bitterness, and the tannins and phenols from the barley provide a dry, refreshing quality that makes it extremely quenching in humid Japanese summers. Mugicha is also deeply embedded in childhood nostalgia for Japanese adults — cold mugicha from the fridge on a humid summer night is one of Japan's most universal food memories. It is completely calorie-free, contains no caffeine, and is considered appropriate for young children. Commercial mugicha tea bags (Kataoka Bussan, Itoen) produce a completely adequate product; traditional roasted loose barley produces a more complex result.
Toasty, slightly bitter, refreshing — the roasted barley creates a gentle, grain-sweet backdrop with pleasant dryness; cold temperature amplifies the refreshing quality; perfect counterbalance to humid Japanese summer heat
Cold-brew mugicha: place 2–3 tea bags in 1L cold water, refrigerate overnight — maximum flavour extraction with minimum bitterness; hot-brew then chill: steep bags in hot water for 3–5 minutes, remove, refrigerate (more tannic, slightly more bitter than cold brew); served over ice or well-chilled without any addition; does not require sweetening (adding sugar is unusual in Japan — mugicha is consumed for its natural refreshing character).
The optimal mugicha-to-water ratio is generous: use 2 tea bags per litre for full flavour; cold-brew produces the smoothest, most refreshing result and is the standard home method; mugicha granules (instant mugicha powder) dissolved in cold water is acceptable for immediate service; in recent years, mugicha has appeared in specialty coffee contexts as a caffeine-free espresso-adjacent cold drink — the roasted character does share some aromatic territory with coffee.
Over-steeping mugicha in hot water (produces excessively bitter, tannic brew); adding sugar (mugicha's natural bitter-roasty quality is its appeal — sweetening disrupts the refreshing function); treating mugicha as a substitute for green tea (completely different flavour profile — it is its own tradition and should not substitute for green tea in contexts where green tea is specifically called for).
Japanese Food Culture — Naomichi Ishige