Vaishnava Dharmashastra 51.35

51.35

yavagodhūmapayovikāraṃ snehāktaṃ śuktaṃ khāṇḍavaṃ ca varjayitvā yat paryuṣitaṃ tat prāśyopavaset ||

For eating (unawares) stale food, other than a mess prepared with barley (such as cakes), or with wheat (such as, gruel), or with milk (boiled with rice, or mixed with coagulated milk, or otherwise dressed), and dishes sprinkled with fat (such as clarified butter), sour gruel, and sweetmeats, he must fast (for one day).