Decorate the Mold. Melt the colored or white melting candy and drizzle into a clean, dry candy bar mold in any pattern you like. Refrigerate for 15 minutes to set.

Coat with Chocolate. Melt 1 cup of the chocolate and spread it inside the mold, coating the bottom and sides evenly. Tip the mold to let excess chocolate run out, then scrape the edges clean. Refrigerate for 15 minutes.

Toast Kataifi. In a nonstick skillet, toss kataifi with melted butter and toast over medium heat until golden and crisp. Let it cool.

Make the Filling. Mix pistachio butter and tahini in a bowl. Fold in the cooled kataifi until well combined.

Fill the Mold. Spread the filling over the set chocolate, leaving a small border around the edges so the final chocolate layer can seal the bar.

Seal the Bar. Melt the remaining 1 cup of chocolate and spread it over the filling. Scrape the top flat with a knife or scraper.

Set the Bar. Refrigerate for about 30 minutes, or until completely set.

Unmold & Enjoy. Carefully pop the bar out of the mold. Avoid bending silicone molds to keep your decorative top intact.