Shake. Strain to rocksglass over fresh ice. Top with soda. Garnish with lime spiral and be sure to express some of the oils over the top of the glass.
The Spiced Bitters is a 50/50 blend of Ango and Allspice Dram, and is taken from a recipe featured at Metrovino, Portland.
Was playing around with the homemade ginger liqueur and this drink was the result.