Meat can be offered to Deities. It's approved by Vedas, Smritis as well as Tantras. But only such meat that is prepared without salt and spices.
Such meat is considered as a sacrificial food or Havi i.e. food fit to be offered to Deities.
Manu Smriti 3.257. The food eaten by hermits in the forest, milk,
Soma-juice, meat which is not prepared (with spices), ...
Nither a vedic source, nor a very direct statement. In Nila-Saraswati Tantra 12th Ullahasa 9th Verse:
तावत्तन्त्रे भेदबुद्धिस्तावदेव प्रृथक् क्रिया।
हरिहरे भेदबुद्धिर्जायते जगदम्बिके-! ॥
Until that* is realized the tantras would be separate, until that the actions (kriya) are separate. Until that 'Hari' and 'Hara' would be different.
Thus the one god, Janarddana, takes the designation of Brahma, Visnu,
and Siva, accordingly as he creates, preserves, or destroys. Visnu, as
creator, creates himself; as the preserver, preserves himself; as the
destroyer, he destroys himself at the end of all things.
(Vishnu Purana I.2.62-63)