Be whisked off to the French countryside -- in spirit -- by this pretty, custardlike cake.
Preheat oven to 350 degrees. Place sliced almonds in a single layer on a rimmed baking sheet. Toast until they are fragrant, about 5 minutes. Transfer to a wire rack to cool. Use 1 tablespoon melted butter to coat six 4 1/2-by-1 3/4 inch round baking dishes, and set aside.
Place flour, 2/3 cup sugar, salt, and almonds in the bowl of a food processor fitted with the metal blade; pulse until mixture is finely ground. Transfer to a medium bowl. Add eggs, egg yolks, 3/4 cup cream, vanilla scrapings, and lemon zest, and whisk to combine. Place in refrigerator, and let rest 30 minutes.
Place cherries in a medium bowl; add kirsch, if using, and let macerate 30 minutes. Divide among dishes. Whisk remaining butter into batter; pour batter over cherries, and place dishes on a rimmed baking sheet. Bake 20 minutes. Sprinkle with remaining sugar; bake until tops are golden and bubbling, 15 to 20 minutes. Transfer to a wire rack to cool.
Whip remaining 1/2 cup cream until soft peaks form. Serve clafoutis warm or at room temperature, topped with whipped cream.
After whisking the batter, let it rest to ensure that it reaches the proper consistency when it bakes.