Step 1Place the halvah on a serving plate.
Step 2Chop the chocolate into ¼- to ½-inch pieces and place in heatproof or microwaveable bowl. Just before serving, partially melt chocolate, without stirring, over simmering water or in microwave oven; you should still have lots of chocolate chunks visible.
Step 3Spoon chocolate over top of halvah, allowing some to flow down the sides. Top with a thick layer of chopped nuts. Sprinkle with fleur de sel and pepper. Use a zester to garnish with long curls of orange peel, if desired.