Peel, core, and halve the apples. Slice each half thinly without cutting all the way through so they stay slightly connected.
Toss with lemon juice, cinnamon, and sugar, then set aside.
Make the batter
In a bowl, whisk together the flour, baking powder, salt, and sugar.
In a separate jug, combine the oil, oat milk, coconut custard, and vanilla.
Pour the wet ingredients into the dry and mix until smooth. The batter should be thick but still pourable.
Assemble
Preheat the oven to 350°F (180°C / 160°C fan).
Grease and line your springform pan.
Pour in the batter and smooth the top.
Arrange the apple halves on top, cut side up, gently fanning them out.
Bake
Bake for 50-60 minutes, until golden and set. A skewer inserted into the center should come out mostly clean.
If the top is browning too quickly, loosely cover with foil toward the end.
Cool & finish
Let the cake cool in the pan for 20-30 minutes before removing.
Dust with icing sugar just before serving.
Notes
For a slightly more custard-forward finish, drizzle 2-3 tablespoons of coconut custard over the apples before baking.Use firm apples so they hold their shape during baking.The cake will continue to set as it cools - don’t worry if it feels a little soft when it first comes out of the oven.
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