Line an 8x8-inch sheet pan with parchment paper and set aside.

Heat chocolate in a small saucepan over low heat, stirring constantly with a spatula until melted and smooth. Pour melted chocolate onto sheet pan and smooth with spatula to create an even layer. 

Sprinkle with almonds, orange zest and sumac.

Chill 20 minutes or until set. Break or cut into large chunks. Serve slightly chilled. Keeps in the refrigerator for up to 1 week.