Preheat oven to 375°F / 190°C / Gas mark 5.
Butter a 2 quart, shallow baking dish with 2 tbsp. unsalted butter.
Add pitted cherries to baking dish and spread evenly across the bottom.
To a blender, add eggs, flour, vanilla, amaretto, sugar, milk and sea salt. Blend until batter is thoroughly combined.
Pour custard batter over cherries and bake for 40 - 45 minutes, or until a knife inserted into clafoutis comes out clean.
Let cool, then dust with 2 tbsp. powdered sugar.