This cake contains chopped hazelnuts.
Katakana spelling of the plant name ハシバミ, used in botanical or commercial contexts.
Compound of 榛 (hashibami, 'hazel tree') + の (possessive particle) + 実 (mi, 'nut, fruit'). The word はしばみ itself is of native origin, likely related to the tree's appearance or habitat, but the exact derivation is uncertain.