Boomsma Claerkampster Clooster Bitter LiqueurBoomsma Claerkampster Clooster Bitter Liqueur is an authentic Dutch herbal elixir that brings centuries of tradition and a burst of complex flavors to your at home cocktail making endeavors. Crafted with care and passion, this exquisite liqueur holds the key to unlocking a realm of extraordinary cocktail possibilities. It is considered an acceptable substitute for Chartreuse Green, though the cocktails will have a slightly different quality.