America
Some very interesting cocktail bitters from Bittermens in America (we probably could say that about everything they come out with), their Hellfire Habanero Shrub Bitters are made with a classic vinegar-based shrub at the core. However, instead of making a fruit shrub, they've gone and made a Habanero pepper shrub, which is fortified with alcohol and concentrated, so it can be used as you would regular bitters. These will add a good burst of fiery heat to your cocktails without knocking the balance of your drink out of whack.

These are great fun product - the only thing that hold me back from giving them 5 stars is that you have to put lots of drops in your drink to feel them. This is more given to the fact that Bittermens come with a dropper top rather than a dasher but they could be stronger - precision is probably preferable. If you're curious what to try them in, anything whiskey based works well - the Albuquerque Old Fashioned is great. I also put them in beer.