For the almond lace bowls: Combine the butter, corn syrup and sugar in a pot over medium heat until simmering. Whisk together the flour and almonds, and then stir into the butter mixture, 1 minute. Transfer to a bowl and refrigerate covered, 1 hour.
Preheat the oven to 350 degrees F.
Scoop tablespoons of batter and roll into balls. Place 3 inches apart on a parchment paper-lined baking sheet (only 4 balls per row), and bake until golden, 10 minutes. Let cool until they can be touched, but are still warm enough to be pliable. Place on top of a small inverted bowl to shape, and then let cool until hardened completely, 2 minutes.
Transfer the chocolate mousse to a piping bag and pipe into the almond lace bowls. Garnish with toasted almonds.