
Blackberries are the edible fruit of various Rubus species, used fresh as a cocktail garnish and muddling fruit.
Dark, jammy fruit with a moderate aroma, low sweetness and only slight tartness.
A few berries are muddled to release colour and juice or speared whole as a garnish; because muddling frees many small hard seeds, the pulp is usually strained out, and the fruit's modest sweetness and acidity are commonly adjusted with syrup or citrus.
As a rim, float or small muddled accent, another fresh soft fruit works loosely, with any sweetness or tartness rebalanced by syrup or citrus; where the drink is built around blackberry as its signature flavour and colour, no swap recreates it.
Raspberries
Both are aggregate Rubus fruits built from drupelets, but a ripe raspberry is red and hollow, pulling free of its receptacle, whereas a blackberry is dark purple-black and keeps its solid white core.
Grown on bramble canes, the blackberry is botanically an aggregate fruit rather than a true berry — a cluster of small drupelets, each developing from a separate carpel of one flower and typically holding a single seed.
Highly perishable — refrigerate and use quickly, as the anthocyanin colour also dulls with light, oxidation and metal exposure once muddled.