Prep your pound cake by cutting it into 1-inch cubes — you want them small enough to fit nicely in layers. Toss your sliced strawberries with the lemon juice and half the sugar, then let them sit for 10 minutes so the juices release. This creates a natural syrup that soaks into the cake beautifully.
Heat your whole milk in a small saucepan over medium heat until it's steaming hot but not boiling. Remove from heat and stir in the gelatin powder until it completely dissolves (takes about 2 minutes of stirring). Add the vanilla custard and butter, whisking until everything's smooth and the butter melts completely.
Let the custard mixture cool to room temperature for about 5 minutes, then refrigerate for 15 minutes. You want it chilled but still pourable for layering. Meanwhile, whip your cream with the remaining sugar and vanilla extract until you get soft peaks (not stiff — you need it spreadable).
Grab a large trifle dish or clear bowl to really show off those layers. Start with a thin layer of cake cubes on the bottom (about 1/3 of your cake). This Easter strawberry trifle recipe looks amazing in glass, so the clear dish is worth using if you have one.
Top the cake with about 1/3 of your strawberries and their juices, letting some drip down onto the cake. Pour about 1/3 of the cooled custard mixture over the berries. Spread 1/3 of the whipped cream on top, smoothing it gently with a spatula.
Repeat the layers two more times — cake, strawberries, custard, whipped cream — building up height and flavor. Don't stress if your layers aren't perfectly even; the messy look actually makes it feel more homemade. Sprinkle the orange zest on top for a pop of color and brightness.
Cover loosely with plastic wrap and refrigerate for at least 4 hours (overnight is even better). The flavors meld together and the cake absorbs all that strawberry juice. When you scoop it out, you'll get all the layers in every bite — that's the whole magic of a trifle.