Melt the couverture in a bain-marie. Add wildflower mix to soak. In a medium bowl whisk the egg and sugar until fluffy. Soak gelatine in water till softened, squeeze out excess moisture and dissolve in warmed rum. Add couverture to the egg mixture, stir gently, adding the dissolved gelatine rum as well. Fold in whipped cream and leave in cool place for at least 4 hours.