Sasage (Cowpea / Black-eyed Peas)

The preference for sasage (ささげ) over azuki for sekihan in Tohoku and Kanto regions is rooted in cultural symbolism around ceremonial occasions. Azuki, despite being the more famous Japanese red bean, has skins that tend to crack and split during the long cooking time required for sekihan. The cracked beans (in the Japanese cultural reading) suggest 'breaking,' 'splitting,' or imperfection — these connotations are inappropriate for ceremonial occasions like childbirth celebrations, school graduations, weddings, and New Year. Sasage, with its tougher skin, holds together intact through cooking, suggesting 'wholeness' and 'completeness' — more auspicious connotations for celebrations. This regional preference is strongest in Tohoku (where samurai tradition particularly disliked the 'split' connotation) and Kanto. Other regions (notably Kansai) traditionally use azuki for sekihan without concern about the connotation. For OEM positioning: sekihan products marketed for ceremonial occasions, particularly with Tohoku or traditional positioning, should consider using sasage; mainstream sekihan products use azuki. Clear ingredient disclosure is appropriate.