Pompelmo Sour

1 12 oz Gin, Dorothy Parker
12 oz Amaro Montenegro
34 oz Lemon juice
12 oz Grapefruit oleo-saccharum (See notes)
1   Egg white
2 ds Bitters, Angostura
1 twst Grapefruit peel (as garnish)
Instructions
Dry shake; shake; strain; up; garnish
Notes
For grapefruit oleo saccharum, remove outer peel of one large grapefruit and roughly chop. Add 2 c. sugar and let sit for one day. When citrus oils have infused into sugar, add 1.5 c. water and combine until dissolved.
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