
Blackberry purée is blackberry pulp blended smooth and sieved, a thick, non-alcoholic fruit base.
It brings fruit, acidity, body and a deep color in a single measure, and the body is the part a juice cannot give. In a shaken sour it thickens the texture and helps the foam stand.
Unsweetened bar purée
Brands like Boiron swap in straight.
Homemade purée
Blend fresh or frozen blackberries and press them through a sieve to catch the seeds.
Sweetened fruit purée
Some commercial purées contain added sugar. Read the label and cut back any syrup accordingly.
Raspberry or blueberry purée
Use the exact same amount. The body stays the same, only the berry flavor changes.
Blackberry syrup
It is far sweeter, so use much less and taste as you go. It adds no body.
Blackberry juice
A last resort. It brings color and flavor but leaves the glass thinner, missing that thick texture.
Fresh purée keeps a few days refrigerated and freezes well, which suits something used in small measures. Freeze it in portions, because thawing and refreezing the tub turns it watery.