In order to make aerated chocolate bars, you will need a food saver and an isi gourmet whip.
Over a pot of simmering water, melt 250g of chocolate.
Once the chocolate is melted, add 15-20% of cocoa butter by weight.
Transfer chocolate mixture into a isi gourmet whip and place two charges in the canister.
Dispense chocolate mixture into a food saver marinator.
Vacuum chocolate until it doubles in volume. Place mixture into freezer until set, release pressure and serve.