Dazzle your guests with this glorious Clementine Trifle, a heavenly fusion of citrus, Italian liqueur, and sweet creamy goodness.
Slice off the ends of each clementine, then cut off the peel and pith. Cut each clementine into ¼-inch (6 mm) thick rounds and place them in a shallow baking dish.
Preheat the oven to 350°F (180°C) and butter and line with parchment a 9-inch (23 cm) round cake pan. Set aside.
Line the bottom of a clear glass trifle dish with some of the clementines. Cut the cake into 1-inch (3 cm) cubes and layer on top of the clementine slices. Arrange the remaining clementine slices flat against the walls of the trifle dish. Pour any collected syrup from the clementines over the cake. Spoon the crème anglaise on top of the cake cubes and refrigerate for at least 2 hours (and up to overnight) to let set.
With a stand mixer fitted with a whisk attachment or a handheld mixer and a medium bowl, whip the cream and powdered sugar on medium-high speed until you have medium-soft peaks. Pour in the amaretto and whisk until combined.