Charak Samhita
विरुद्धं पाकतश्चापि दुष्टदुर्दारुसाधितम्। अपक्वतण्डुलात्यर्थपक्वदग्धं च यद्भवेत्। संयोगतो विरुद्धं तद्यथाऽम्लं पयसा सह ॥९९॥
Antagonism in terms of cooking consists of cooking using damaged or bad fuel or if the grains are left uncooked, over-cooked or burnt. Sour things taken with milk is antagonism in terms of combination.
english translation
viruddhaM pAkatazcApi duSTadurdArusAdhitam। apakvataNDulAtyarthapakvadagdhaM ca yadbhavet। saMyogato viruddhaM tadyathA'mlaM payasA saha ॥99॥
hk transliteration by Sanscript