Peel potatoes and press through a press. Separate the eggs. Mix vanilla sugar, sugar, egg yolks and salt with the whisk of a hand mixer until sugar is dissolved.
Add almond kernels and potatoes. Beat egg whites until very stiff and fold into potato mixture.
Grease a 28 cm loaf pan and line with almond kernels. Pour the potato mixture into it and smooth it out.
Bake in a heated oven (electric oven: 200 °C / convection oven: 180 °C / gas: level 3) for about 75 minutes. Cool in the pan and turn out.
Crush the lemon glaze, melt it in a hot water bath and coat the cake with it. Rinse the lime, cut into thin slices and halve. Cover the cake with it.
Have fun with this fine cake!