Jamieson, Fausset and Brown on 1 Peter 2:3

3. Peter alludes to Psa 34:8. The first "tastes" of God's goodness are afterwards followed by fuller and happier experiences. A taste whets the appetite [Bengel].

gracious--Greek, "good," benignant, kind; as God is revealed to us in Christ, "the Lord" (1Pe 2:4), we who are born again ought so to be good and kind to the brethren (1Pe 1:22). "Whosoever has not tasted the word to him it is not sweet it has not reached the heart; but to them who have experienced it, who with the heart believe, 'Christ has been sent for me and is become my own: my miseries are His, and His life mine,' it tastes sweet" [Luther].