Take a chilled coffee mug, add the Prickly Ash Bitters and cold brew coffee. Stir well to mix. Top with tonic water to give a nice brown fizz on the top. Garnish with the lime wedge and serve.
The Nostrum (essentially "cure-all), is a simple, low alcohol cocktail that focuses on the complexity of the Prickly Ash Bitters while adding a nice bright note that brings out the flavors of the coffee and amaro.