Cook the black rice in a pan as you would popcorn.

Heat the smaller portion of cream, the glucose and the invert sugar. Slowly combine this hot mixture with the melted couverture. Immediately mix using an immersion blender to make a perfect emulsion. Add the larger portion of cold whipping cream. Mix again. Leave to set in the refrigerator, preferably for 12 hours. Whisk until the texture is consistent enough to use in a piping bag or with a spatula.