Preheat your oven to 350°F (180°C) and line a 9-inch (22cm) cake pan with parchment paper.
In a large bowl, whisk together the almond flour, poppy seed flour, erythritol, and baking powder.
In a separate bowl, beat the eggs until light and fluffy. Then, whisk in the coconut oil, vanilla extract, and lemon zest.
Gently fold the dry ingredients into the wet ingredients until just combined. Be careful not to overmix.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool completely in the pan before frosting.
Once the cake is cooled, slice it horizontally into two layers. Spread sugar-free whipped cream generously between the layers.
Frost the top and sides of the cake with the remaining whipped cream. Decorate with poppy seeds or additional lemon zest.
Refrigerate the cake for at least 1 hour before serving to allow the flavors to meld together.
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