Preheat the oven to 400°F. In a blender blend together 1/3 cup of the sugar, the flour, the eggs, the milk, the vanilla, the zest, the almond extract, and the salt until the custard is just smooth. Arrange the cherries in one layer in a buttered 3-cup gratin dish or flameproof shallow baking dish, pour the custard over them, and bake the clafouti in the middle of the oven for 20 to 25 minutes, or until the top is puffed and springy to the touch.