Measure and chill: Measure 3/4 cup Greek yogurt, 3/4 cup mixed berries, 1/4 cup granola, 1 tsp honey and 1 tbsp walnuts. Keep the yogurt chilled until just before assembly — cold yogurt holds its texture and contrast against the room-temperature/macerated berries.

Macerate the berries: Put the mixed berries into a small bowl. Add 1/2 teaspoon of the honey (reserve the remaining 1/2 tsp for finishing) and a quick squeeze or 1/8 teaspoon of lemon juice if you like brightness. Gently toss and let sit 5–8 minutes. Why: Macerating softens the berries slightly and draws out their juices, concentrating flavor and creating a fragrant syrup that melds with the yogurt without needing extra sugar.

Sweeten and aerate the yogurt: In a separate small bowl whisk the Greek yogurt with the remaining 1/2 tsp honey and the optional 1/8 tsp vanilla extract until smooth and slightly airy. Why: Whisking incorporates a touch of air for a silkier mouthfeel and disperses the honey so each bite is evenly sweet. If you whisk cold yogurt straight from the fridge it will fold light rather than break down.

Refresh the granola (optional): If your granola has been sitting in a container and lost some crispness, spread the 1/4 cup on a small baking sheet and toast in a 325°F (160°C) oven for 2–3 minutes, watching carefully. Or toast the crumbled walnuts in a dry skillet over medium heat for 1–2 minutes until fragrant. Why: Toasting revives crunch and activates the oils and aromatics in the nuts and granola without adding fat — the warmth intensifies flavor and gives better texture contrast.

Layer the parfait: Choose a clear glass to show the layers. Spoon about half the sweetened yogurt into the bottom (this base anchors the berries and prevents the granola from getting soggy). Add a layer of half the macerated berries, then sprinkle half the granola. Add the remaining yogurt, the rest of the berries, and finish with the toasted granola and crumbled walnuts on top. Why: Layering in this order — yogurt first, berries, then granola — preserves crunch on top while letting the berries' syrup marry with the yogurt in the middle for creamy bursts of fruit.

Finish and serve: Drizzle the reserved 1/2 tsp honey on the top layer, add a tiny pinch of flaky sea salt and a touch of lemon zest if using. Serve immediately. Why: The final drizzle of honey gives a glossy finish and a slightly sticky top that highlights the crunch; the salt rounds the sweetness and lemon zest brightens the aroma.

Make-ahead notes: If preparing ahead, keep granola and nuts stored separately and layer just before serving to maintain maximum crunch. Why: Granola absorbs moisture from the fruit and yogurt over time and will become soggy if mixed too far ahead.