Layered Lemon Custard Cake (Double-Baked with Cream Center)

Name: Layered Lemon Custard Cake
Prep time: 30 min
Cook time: 40 min
Total time: 70 min
Cuisine: International
Ingredients: 3 large eggs, room temperature; 1 pinch salt; 8 g vanilla sugar; 190 g granulated sugar; 190 ml neutral oil, such as canola or sunflower; 190 ml milk, whole, room temperature; 260 g all-purpose flour, sifted; 10 g baking powder; 1 large egg; 40 g granulated sugar; 16 g cornstarch; 480 ml milk, whole; 1 tbsp lemon zest, finely grated; from 1 lemon; 90 ml lemon juice, freshly squeezed; from 2 lemons

What You Need

Ingredients

12 slices

FAQ

Frequently Asked Questions

A soggy middle happens if the custard wasn't cooked on the stovetop until fully thickened, or if you sliced the cake while it was still warm. The filling must be heavy, dense, and completely cold before assembling.

Freshly squeezed lemon juice is crucial for the correct bright, acidic flavor profile. Bottled juice often contains preservatives that can give the delicate milk-based custard a bitter, metallic aftertaste.

Gently press the center of the top layer; it should spring back immediately without leaving an indentation. You can also insert a toothpick at a shallow 45-degree angle just into the top sponge layer to check for wet batter without piercing the custard.

If the custard isn't thickening on the stove after several minutes of simmering, dissolve an additional teaspoon of cornstarch in a small splash of cold milk, whisk it into the hot saucepan, and cook for another two minutes until heavily coating the spoon.

Because it contains a cooked milk and egg-based custard center, this cake must be stored in an airtight container in the refrigerator. It will stay fresh and safe to eat for up to 3 to 4 days.

Freezing is strictly not recommended. The cooked cornstarch custard will break and weep liquid when thawed, instantly ruining the texture of the surrounding sponge layers and turning the cake mushy.

For the cleanest slices and best texture, serve the cake chilled directly from the refrigerator. The cold temperature keeps the custard firm, preventing it from oozing out, and heavily highlights the tart citrus flavor.

Step By Step

Instructions

Custard Prep
Whip Up the Lemon Custard
Grab a saucepan and whisk together your egg, granulated sugar, cornstarch, milk, fragrant lemon zest, and fresh-squeezed lemon juice. Set it over medium heat and keep whisking without stopping so the egg gently cooks rather than scrambling on you.
1 large egg1 3/8 oz granulated sugar16 g cornstarch2 cup milk1 tbsp lemon zest3/8 cup lemon juice
Custard Cooking
Thicken and Chill the Custard
Keep up a steady whisking rhythm until the liquid transforms into a thick, glossy custard that generously coats the back of your spoon. Pull the pan off the heat and let it cool completely down to room temperature, pressing plastic wrap right against the custard so it doesn't form a tough skin.
1 large egg1 3/8 oz granulated sugar16 g cornstarch2 cup milk1 tbsp lemon zest3/8 cup lemon juice
Batter Prep
Whip the Batter Base
Set your oven to 170C (338F) and grease a rectangular baking dish generously. In your main mixing bowl, beat together the eggs, salt, vanilla sugar, and granulated sugar until the mixture looks pale, fluffy, and has roughly doubled in volume.
1 large egg1 pinch salt8 g vanilla sugar1 3/8 oz granulated sugar
Bring the Batter Together
Slowly drizzle in the neutral oil and milk on low speed just until everything comes together nicely. Sift in the all-purpose flour and baking powder straight into the bowl, using a gentle folding motion with your spatula so you keep all that lovely whipped air while banishing any flour pockets.
3/4 cup neutral oil2 cup milk9 1/8 oz all-purpose flour10 g baking powder
First Bake
Bake the Bottom Sponge
Pour half of your batter into the prepared dish and ease it gently into the corners for an even surface. Slide it into the preheated oven and bake just until the top feels set and gives a gentle spring back when lightly touched.
Assembly
Layer the Cool Custard
Pull your half-baked sponge out of the oven and spread that completely cooled lemon custard across it in an even layer, leaving a tiny gap around the rim. Gently ladle the remaining batter right over the custard so the filling stays securely tucked inside.
Final Bake
Final Bake and Full Cool
Pop the pan right back into the oven and let it bake until the top turns a warm golden color and a tester poked lightly into just the top sponge comes out clean. Be patient and let the whole dish cool completely to room temperature before cutting so those creamy slices come out clean.

The clever trick here is doing two separate bakes so a rich lemon custard stays neatly sandwiched between light sponge layers. You first bake the bottom sponge just enough so it can hold the weight of the filling, smooth on the fully chilled custard, and then spoon the rest of the batter right over top.

Make sure you let that cornstarch-thickened custard chill all the way down before assembling. If it is even slightly warm or runny, it melts into the sponge and you lose those gorgeous, sharp layers. Once the cake has cooled down completely, give it a pretty dusting of powdered sugar right before everyone digs in.