French Chocolate Mousse with Orange

1 . Stage

Grind orange zest using a mortar and pestle until it forms a smooth paste.

2 . Stage

Combine chocolate, coffee, and orange zest in the top of a double boiler over simmering water. Stir frequently, scraping down the sides with a rubber spatula to avoid scorching, until chocolate is melted, about 5 minutes. Stir until smooth and remove from heat. Allow to cool slightly

3 . Stage

Beat egg whites and salt in a glass, metal, or ceramic bowl until stiff peaks form (see Editor's Note).

4 . Stage

Add egg yolks to the slightly cooled chocolate mixture and stir until well combined. Pour over egg whites. Carefully fold together using a spatula until just combined.

5 . Stage

Pour mixture into 10 small dessert glasses or 1 large serving dish. Refrigerate at least 6 hours to overnight.