Blackthorn Sour — The Cocktail Ontologist

Variants (2)

The Hoffman House Bartender's Guide by Charles S. Mahoney (1905, p.200)

2 teaspoonfuls	lime juice — lime or lemon juice	acid
0.67 mixing glass	ice — shaved ice	base
1 wine-glass	sloe gin — Sloe gin	base
	fruit — Dress with fruit.	garnish
0.5 teaspoonful	Abricotine — Abricotine	modifier
1 teaspoonful	pineapple syrup	sweetener

Fill the mixing glass two-thirds full of shaved ice and add the lime or lemon juice, pineapple syrup, abricotine, and sloe gin, then stir well.
Strain into a claret glass, dress with fruit, and serve.

Garnish: Fruit

Ice: Shaved ice

Bartenders' Guide: How to Mix Drinks by Wehman Bros. (1912, p.65)

2 teaspoon	lemon juice — Lemon juice	base
1 wine-glass	sloe gin — Sloe gin	base
	fruit — Fruit	garnish
0.5 teaspoon	Abricotine — Abricotine	modifier
1 teaspoon	pineapple syrup — Pineapple syrup	sweetener

Stir the lemon juice, pineapple syrup, abricotine, and sloe gin well, strain into a claret glass, add fruit, and serve.

Ice: Ice

See also: Santa Cruz Sour, Dizzy Sour

Source gives lime or lemon juice.