bath of dried leaves (esp. daikon and turnip)
A rare traditional practice, mainly historical or regional, of bathing in water infused with dried daikon or turnip leaves.
In the past, a bath of dried leaves was believed to help with sensitivity to cold.
Compound of 干菜 (ほしな, dried leaves) and 湯 (ゆ, hot water). The exact historical origin is uncertain, but it refers to a traditional herbal bath.