Psalm 34:8 invites the reader (or listener) to “Taste and see that the Lord is good.” In the context David recounts how God had delivered him from something he deeply feared, and he calls upon those who know God to exalt Him. The Psalm is a rich testimony of the faithfulness of God in the lives of those who depend on Him.
While it addresses “saints” (34:9), and is thus not inherently evangelistic, the theme, content, and delivery fits well Peter’s apologetic paradigm from 1 Peter 3:15. It certainly offers an account of the hope that was within the Psalmist. Again, even though David addresses saints in the near context, his invitation to “taste” in verse 8 implies that his intended audience in the immediate context had not yet tasted.
It is fitting, I think, to draw a secondary application of Psalm 34:8, suggesting that such an invitation would be fitting for an apologetic/evangelistic encounter – especially in engaging the common sentiments of Millennials and iGens.