Japanese Mugicha and Barley Infusions: Summer Cold-Brew Culture and Non-Caffeinated Tradition

Japan — nationwide, medieval origins

Mugicha — roasted barley tea — is the default cold drink of summer in Japan, the beverage of children and elders, the cooling companion to festival foods. Unlike green tea, mugicha contains no caffeine, making it appropriate for family meals and evening service. Its flavour — roasted, slightly bitter, gently sweet, with cereal and smoke notes — bridges the sensory worlds of coffee and herbal infusion. The roasting process drives Maillard browning producing pyrazines and maltol — the same compounds that give popcorn, coffee, and roasted bread their aromas. Cold-brewed mugicha (cold water, 6-8 hours refrigerated) produces a cleaner, less bitter result than hot infusion — the contemporary standard. Beyond mugicha, the broader category of grain teas (sobacha/buckwheat tea, koshihikari genmai/rice grain teas) reflects Japan's tradition of infusing roasted grains as alternatives to leaf tea.

• Nearly identical tradition — roasted barley cold-brewed, served as house water substitute, no caffeine → Boricha (Korean barley tea) Korean
• Same grain, similar preparation — Chinese version often served warm in northern regions as digestive → Damai cha (barley tea) Chinese

Roasted cereal, gentle smokiness, mild bitterness, light sweetness — cooling and grounding, pairs with grilled foods