Ingredients
Method
Prepare the lemon custard
- Remove lemon zest from all lemons and set aside.
- In a saucepan, whisk together the sugar, cornstarch, salt, buttermilk, and lemon juice from the lemons.
- Cook this mixture over medium heat, stirring constantly, until it thickens and starts to bubble.
- Slowly add about one-quarter of this hot mixture into the beaten egg yolks to temper them, then pour the egg yolk mixture back into the saucepan.
- Continue cooking over medium heat, stirring constantly for an additional 2 minutes until thickened.
- Remove from heat and stir in butter and vanilla until the butter melts completely.
- Cover the custard surface with plastic wrap to prevent skin formation and chill for at least 2 hours.
Bake the sponge cake
- Preheat the oven to 350°F (175°C).
- Beat the egg with an electric mixer on high speed for about 3 minutes until thick and pale.
- Gradually add sugar and lemon zest, beating an additional 4 minutes.
- In a separate bowl, sift together flour, baking powder, and salt; gently fold this into the egg mixture.
- Warm buttermilk and butter in a small saucepan or microwave until the butter melts, then gradually stir in vanilla.
- Incorporate this milk mixture into the batter until smooth.
- Pour the batter into a greased and floured 8-inch round cake pan.
- Bake for 16 minutes or until a toothpick inserted in the center comes out clean.
- Allow to cool on a wire rack for 10 minutes before removing from the pan, then cool completely.
- Cut the cake into 1-inch cubes.
Prepare the berry mixture and assemble
- In a bowl, mix thawed raspberries, blueberries, and sugar. Let the mixture sit while you whip the cream and finish assembling.
- Using an electric mixer, whip heavy cream with sugar to your desired sweetness and consistency.
- Fold a few heaping spoonfuls of whipped cream into the chilled lemon custard to lighten it.
- Reserve the remaining whipped cream for topping.
- Using individual trifle cups or small bowls, layer the dessert starting with lemon custard, followed by sponge cake cubes, then the berry mixture.
- Repeat layering until ingredients are used up, usually two layers in small cups.
- Finish with a generous layer of custard on top.
- Cover and chill the assembled trifles until ready to serve.
- Just before serving, top each trifle with the remaining whipped cream.
Notes
These trifles can be stored in the refrigerator for up to 2 days. Keep them covered to prevent drying out. This dessert is best enjoyed fresh but can also be frozen for up to a month. If freezing, omit the whipped cream topping until ready to serve for optimal texture.
