Line the square dish with parchment paper, leaving some overhang for easy removal.
Chop the dark chocolate into small pieces and microwave in short bursts, stirring each time, until smooth and glossy.
Spread the almonds on a baking sheet and toast in a preheated oven at 180°C (356°F) for 8-10 minutes until fragrant and golden. Let cool slightly.
In a bowl, combine the melted chocolate, butter, honey, vanilla extract, and a pinch of sea salt. Stir until smooth and well incorporated.
Fold in the toasted almonds until evenly coated with the chocolate mixture.
Pour the mixture into the prepared dish, spreading it evenly with a spatula and pressing down gently to compact.
Press extra sea salt on top if desired, then refrigerate for at least 2 hours until firm and glossy.
Once set, lift the bars out of the dish using the parchment overhang and cut into 8-10 rectangles with a sharp knife, warming the blade slightly for clean cuts.
Serve immediately or store in an airtight container in the fridge for up to a week. Enjoy the rich, fudgy crunch!