Half Mast

2 oz Madeira, Broadbent Rainwater Medium Dry
34 oz Grapefruit shrub
Instructions
Build in a shaker, shake hard briefly, strain over rocks glass with fresh rocks.
Notes
Grapefruit shrub: Grapefruit peels, turbinado sugar, grapefruit juice, champagne vinegar.
History
Shrub by Derek Mercer