Whisk 1 1/2 cups flour, almond flour, sesame seeds, baking
powder, baking soda, and sea salt together in a medium bowl.
In the bowl of a stand mixer, cream together butter and 1 1/3
cup sugar, 5 minutes. Add tahini and beat for 1 minute, scraping down sides of
bowl periodically. Add egg and egg yolk and beat until pale and fluffy. Switch
to a low speed, and alternate between mixing in flour mixture and
buttermilk, beginning and ending with dry ingredients. Toss pear in remaining 2
tablespoons flour and fold into batter.
Scrap batter into prepared pan and sprinkle with remaining 2
Bake for about 1 hour and 20 minutes, or until a
toothpick inserted into the center comes out clean.