Melt the white chocolate chips in the microwave in 15 sec intervals and giving it a mix every 15 secs, till it is all melted. Mix the rose extract and ground cardamom to it. Line a baking sheet with parchment paper and pour this white chocolate over it and spread it out. Immediately sprinkle the dried roses and toasted almond slices over it. Let it cool outside at room temperature (or you can chill it in the refrigerator) fro about 30 mins or so till the chocolate has hardened. Break into bark and you are ready to go!