Preheat oven to 350 degrees and grease the bottom and sides of a 13" x 4" tart pan with cooking spray. Pulse almond flour and ½ cup sugar together in a food processor until combined. Add butter, egg and pear liquor or almond extract and process until smooth.
Cut pears lengthwise into 6 pieces each and toss with lemon juice and set aside. Whisk flour, baking powder, baking soda and salt together in a small bowl and add to food processor. Pulse until combined well.
Using a spatula, spread batter evenly into tart pan, lift and drop a few times to settle and rid batter of any air bubbles. Arrange pear pieces on top and lightly press into batter. Sprinkle remaining teaspoon sugar and cinnamon over the top of the cake and place tart pan on a baking sheet before putting in the oven.
Bake for 45-55 minutes until cake is golden brown and tester inserted in the center comes out clean. Allow to cool, serve and enjoy!
Recipe by Jackie Ourman at http://jackieourman.com/gluten-free-pear-cake/