This is a recipe for "Blondui," a white chocolate version of a brownie. It features a refreshing sweet and tart flavor thanks to the generous use of frozen berries. The batter is made by melting butter and white chocolate in a double boiler, then mixing in eggs, granulated sugar, strawberry jam, cake flour, and baking powder. The berries, which have been thoroughly drained, are scattered on top, and the mixture is baked in the oven. The balance between the fluffy, moist texture and the tartness of the berries is exquisite, and it is delicious both fresh out of the oven and after it has cooled down before slicing. Tips on how to prevent the chocolate and butter from separating in the double boiler and hints on storage methods are also included, making it a recipe that even beginners can confidently try.