Blackthorne Cocktail — The Cocktail Ontologist

Family

Jack's Manual by J. A. Grohusko (1908, p.22) — Grohusko 1908

0.5 tsp	Lemon juice (fresh) — lemon juice	acid
1 tsp	Simple syrup (1:1) — syrup	base
0.5 wine glass	sloe gin — sloe gin	base
3 dash	Angostura bitters	bitter
2 dash	orange bitters — orange bitters	bitter
0.25 wine glass	sweet vermouth — Italian Vermouth	modifier
	ice — fine ice	other

Ice: Fine ice

Nose: Sloe fruit, bitters, and vermouth rise in balance.
Palate: This is historically useful because it keeps the Blackthorne as a real sloe-vermouth aperitif family member rather than just a loose berry cocktail.
Finish: The finish is tart-sweet, bitter, and vinous.
Summary: A sloe-gin and vermouth aperitif from the berry-bitter branch.

Jack's Manual by J. A. Grohusko (1910, p.36)

Stir the syrup, lemon juice, orange bitters, Italian vermouth, bitters, and sloe gin thoroughly with fine ice.
Strain into a cocktail glass and serve.

Ice: Fine ice

Bartenders' Manual by Bartenders Association of America (1913, p.15)

0.25 teaspoon	lemon juice — Lemon juice	acid
0.75 glass	ice — Fine ice	base
0.5 wineglass	sloe gin — Sloe gin	base
2 dash	orange bitters — Orange bitters	bitter
1 dash	Peychaud or Angostura bitters	bitter
0.5 wineglass	Italian vermouth	modifier
1 teaspoon	syrup — Syrup	sweetener

Ice: Fine ice

Straub's Manual of Mixed Drinks by Jacques Straub (1913, p.17) — Straub 1913

1 piece	lemon peel — Lemon Peel	acid
1 dash	orange bitters — Orange Bitters	base
0.5 jigger	sloe gin — Sloe Gin	base
0.5 jigger	Italian vermouth — Italian Vermouth	modifier

Garnish: Lemon peel

This is a useful pre-war checkpoint for the sloe-gin aromatic line inside the still-crowded cocktail field.

The Ideal Bartender by Tom Bullock (1917, p.20) — Bullock 1917

0.25 teaspoonful	Lemon juice (fresh) — Lemon Juice	base
0.5 jigger	sloe gin — Sloe Gin	base
1 dash	Angostura bitters — Angostura Bitters	bitter
2 dashes	orange bitters — Orange Bitters	bitter
0.5 jigger	vermouth	modifier
1 teaspoonful	simple syrup — Syrup	sweetener

Ice: Shaved ice

This matters because Bullock preserves a compact bittered sloe-gin cocktail form alongside the longer sour branch.

The stirred service distinguishes this drink from the more obviously sour family logic of the Blackthorne Sour.

About Town Cocktail Book by Joe Fitchett (1925, p.8) — Irish whiskey form

	lemon peel — Squeeze on top.	acid
3 dashes	Absinthe	base
0.25 gill	Irish whiskey — Irish Whisky	base
3 dashes	Angostura bitters — Angostura Bitters	bitter
0.25 gill	French vermouth — French Vermouth	modifier

Garnish: Expressed lemon peel

Ice: Broken ice

This matters because it preserves the whiskey-and-vermouth blackthorn line as distinct from the sloe-gin sour branch printed beside it.

Cocktails by Pedro Chicote (1928, p.114) — Pedro Chicote 1928

	Absinthe — A few drops.	base
0.5 part	whisky	base
	orange bitters — A few drops.	bitter
0.5 part	French vermouth — Vermut francés	modifier

Ice: Chopped ice

This matters because it gives us a Spanish late-1920s Blackthorne witness built on whisky rather than sloe gin.

See also: Black Bottom Cocktail, Rob Roy Cocktail