Preheat your oven to 350°F (180°C) and line a 9-inch (22 cm) cake pan with parchment paper.
In a large bowl, whisk together the almond flour, baking powder, and cane sugar.
In a separate bowl, whisk the eggs until light and fluffy. Then, whisk in the coconut oil, lemon zest, and lemon juice.
Gently fold the wet ingredients into the dry 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 before dusting with powdered sugar and garnishing with lemon slices.
Slice and serve, optionally with a drizzle of fresh lemon juice or a dollop of whipped cream.
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