So I have been playing around with some versions of grapefruit bitters recently and came up with a pretty good version. The big test will be of course if it is shelf stable, and won't cloud up on me.
Anyway, here is the recipe.
johnder grapefruit bitters
180 g grain alcohol
60 g Grapefruit zest (no pith -- in strips from vegetable peeler)
10 g Grapefruit zest with pith
10 g Lemon zest
4 g ginger (2 pieces)
5 g gentian
1 g dried spearmint
5 g dried lavender
30 g water
Combine all ingredients, let sit overnight (12 hours)
Strain solids and set aside.
In saucepan melt 3 tablespoons sugar until very dark brown, add 1/4 cup water, stir until dissolved. Add 3 teaspoons of burnt sugar syrup to strained bitters along with 1/4 cup water.
The end product is bitter -- definitely get some of the bitterness from the grapefruit, but the bitter from the gentian helps settle the pith like bitterness from the grapefruit.
The end result is very yellow and has a tremendous aroma of grapefruit. Now to see what I can use it in.