Make Trifle with layers of cake, macerated strawberries, and silky vanilla custard for an easy, impressive dessert.
If you’re starting from mix, bake the white cake (or use a whole angel food cake) according to the package or your preferred recipe. Allow the cake to cool completely on a rack so it holds its shape, then cut into roughly 1-inch cubes on a clean board. The goal is uniform, soft sponge pieces that will absorb the sherry (or orange juice/rum) without turning to mush—tender, springy cubes with a pale, even crumb.
Hull and slice the fresh strawberries into even slices or quarters depending on size, place them in a bowl, sprinkle with 1/4 cup granulated sugar, add the raspberry jam and gently stir until glossy and syrupy. Let the fruit sit at room temperature for at least an hour so the berries release bright red juices and become plump and glossy—sweet, syrupy, and jewel-toned.
In a medium saucepan whisk together the granulated sugar and cornstarch, then whisk in the egg yolks, milk and half-and-half until smooth. Heat over medium-low while stirring constantly; bring to a gentle boil and keep whisking for one minute until the mixture thickens into a silky, pudding-like custard with a satiny sheen. Remove from heat, stir in the butter and vanilla, pour into a medium bowl, press plastic wrap directly onto the surface to prevent a skin, and refrigerate until completely chilled—at least two hours. The finished custard should be cool, thick, glossy, and ladleable.
Place half of the cake cubes in the bottom of a large clear glass trifle bowl and gently drizzle half of the cream sherry (or chosen liquor/juice) so the cubes are damp but intact. Spoon half of the macerated strawberries (with their syrup) over the cake, then spread half of the chilled vanilla custard so it envelops the fruit in a smooth pale layer. Repeat those three layers once more so you have cake–liquor, fruit, custard, and a final custard layer sitting just under the top. The bowl should show distinct, even strata: soft pale sponge, vivid ruby strawberries in glossy syrup, and thick creamy custard.

Whip the heavy cream with powdered sugar until it forms soft, billowy peaks and spread or pipe it over the top of the trifle into a clean, cloud-like finish. Garnish with maraschino cherries and a scattering of slivered almonds if you like, and refrigerate the completed trifle for at least four hours or overnight so the flavors meld and the layers settle into a cohesive, spoonable dessert.
