One-Two Punch

1 12 oz Blended Scotch, Johnnie Walker Double Black Label
12 oz Lemon juice
12 oz Grapefruit juice
12 oz Simple syrup (citrus oleo-saccharum; see note)
3 oz Pilsner, Prima Pils
1 wdg Grapefruit (as garnish)
Instructions
Stir, strain into a pilsner glass over ice, top with pilsner, garnish with a grapefruit half wheel and a pinch of La Boíte Borneo N. 26 Spice Mix.
Notes
Citrus oleo-saccharum: zest 3 lemons and 3 grapefruits and place into a bowl with 12 oz sugar and let stand for 1 hour. Add 12 oz boiling water, stir, fine strain, and cool.
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