Mahabharata 12.186.6
पञ्चार्द्रो भोजनं कुर्यात्प्राङ्मुखो मौनमास्थितःन निन्देदन्नभक्ष्यांश्च स्वाद्वस्वादु च भक्षयेत्
pañcārdro bhojanaṃ kuryātprāṅmukho maunamāsthitaḥna nindedannabhakṣyāṃśca svādvasvādu ca bhakṣayet
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book