Instructions

  1. Place chocolate in blender.
  2. Bring 3/4 cup water, 2 tablespoons sugar, and espresso powder to simmer in medium saucepan, stirring to dissolve sugar.
  3. Pour over chocolate.
  4. Cover tightly; blend 5 seconds.
  5. Add egg whites.
  6. Cover tightly; blend on high 1 minute.
  7. Pour into 4 small bowls.
  8. Chill until firm, about 2 hours.
  9. Whisk cream, lemon juice, peel, and 1 tablespoon sugar in small bowl to very soft peaks.
  10. Spoon over mousse; serve.