doyō mochi; mochi eaten during the dog days of summer
A seasonal food custom: mochi made and eaten during the doyō period (the hottest part of summer).
Doyō mochi is mochi eaten during the summer doyō period.
My grandmother makes doyō mochi for us every year.
Compound of 土用 (doyō, 'dog days of summer') and 餅 (mochi, 'rice cake').