Preheat oven to 325 F. Grease an 8-inch square pan and set aside.
In clean, grease-free bowl beat the egg whites with salt or cream of tartar until stiff. Set aside.
In another bowl beat the egg yolks with water, sugar and vanilla until light. Add melted butter and beat for another minute. Then mix in the flour.
Add the lukewarm milk (cold milk will harden the butter), blood orange juice and zest and beat until incorporated.
Using a spatula, gently fold in beaten egg whites.
Pour the batter into prepared pan and bake for 30 minutes, place blood orange slices on top and bake for another 30 minutes or until the top is golden.
Cool for at least 3 hours before slicing and serving.
Keyword Blood Orange Magic Custard Cake
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