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One of the main uses for bitters is to add aromas to cocktails. These aromas subtly tweak the flavors of the drinks in different directions. Classic aromatic bitters have notes of cinnamon, clove, and cardamon while using several bittering agents to round out the flavors.
Some of the ingredients can be hard to find locally but there are several websites where they can be procured.
Preheat a water bath to 140°F (60.0°C).
Lightly scrub the outside of the orange and lemon then remove the zest with a vegetable peeler or zester. Make sure little to no pith came off as well, using a paring knife to remove any.
Combine all of the ingredients in a sous vide bag or Mason jar then seal. Infuse in the water bath for 2 to 4 hours.
Prepare an ice bath with 1/2 ice and 1/2 water. Remove the bag or Mason jar from the water bath and place in the ice bath for 15 to 20 minutes. Strain the bitters, squeezing any liquid out, and store in a sealed container. They will last for several months if stored in a cabinet or cupboard.