The Bitter Housewife has an interestin story for this one:

"This is our signature flavor and what started this whole company. After making my first batch of bitters and tasting how much better they were than what I was used to, I set about making what I considered the perfect bitters for an Old Fashioned, my favorite cocktail. 

These bitters are full of baking spices like ginger, cinnamon, and allspice to bring out the spice in a rye-based whiskey and balanced with an earthy bitterness that will make your drinks more interesting. 

Try these recipes:
Old Fashioned Bitter Housewife
Champagne Cocktail
Cocchi Prosecco Spritz
Susan's Gin Old Fashioned

Goes great with darker spirits like aged rum, bourbon, and whiskey. We also recommend you try them in any recipe that calls for aromatic bitters or Angostura."

Ingredients: Alcohol, water, organic sugar, dried bing cherries, fresh ginger, cinnamon,  nutmeg, vanilla extract (water, alcohol (35%), sugar, vanilla extractives), quassia, walnut leaf, wild cherry bark, sarsaparilla, grains of paradise, allspice, cassia, gentian, cloves.