A.T. Robertson Commentary 1 Peter 2:3

"if ye have tasted that the Lord is gracious:" — 1 Peter 2:3 (ASV)

If ye have tasted (ε εγευσασθε). Condition of first class with ε and first aorist middle indicative of γευω in figurative sense as in Heb 6:4f. "A taste excites the appetite" (Bengel).

Gracious (χρηστος). Quotation from Ps 34:8. The Hebrew for the LXX χρηστος is simply tobh (good). Plato used the word for food also, and Peter carries out the metaphor in γαλα (milk) as in Lu 5:39.