Budhāṣṭamīvrata is vrata for budha (Mercury). This vrata is has to be done in the eighth day of the Śukla Pakṣa . The manuscript contains how to worship budha graha (Budha as a god). This manuscript gives details how to worship Budha step by step . First pray to budha, then it start for worship in the form of pooja. Pooja will start with foot worship (Pādyapūjā), then offering food like Pañcāṃmṛta and its end on vrata kathā. kathā is on why Budhāṣṭamīvrata is important and how Budha is great. After kathā the Yajamāna offers the food (Naivedya ). (Bhavishya Puran, by Babulal upadhyay , page 191– 192)
Devotional literature for Pārvatī and planet Budha(Mercury), Hindu rituals & observances related to food and bathing, Jyotiṣaśāstra.