Clafoutis is a French baked dessert featuring fruit, traditionally black cherries, covered with a thick flan-like batter. This clafoutis recipe features fresh blueberries marinated in a cinnamon rum sauce for a summer twist on the French classic. The batter is made from a combination of eggs, flour, sugar, heavy cream, and milk and is similar in texture to a waffle batter. Divide your clafoutis into individually portioned dishes before baking or into one large dish.