01 - Preheat oven to 350°F. Grease and line a 9-inch round cake pan with parchment paper.
02 - In a medium bowl, whisk together almond flour, all-purpose flour, baking powder, baking soda, cardamom, and salt.
03 - In a large bowl, cream the butter and sugar together until light and fluffy.
04 - Beat in eggs one at a time, then mix in Greek yogurt (or sour cream), vanilla extract, and lemon zest.
05 - Gradually fold in the dry ingredients until just combined.
06 - Spread half the batter into the prepared pan. Arrange half the pear slices over the batter. Repeat with the remaining batter and pear slices on top.
07 - Sprinkle sliced almonds and turbinado sugar evenly over the cake.
08 - Bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean and the top is golden brown.
09 - Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before serving.