Source: The White House Cook Book (1887)
Blackberry wine is built on extraction and fermentation. The berries must be bruised to rupture cell walls and release their sugars, tannins, and colour into the liquid — intact fruit won't yield properly. Use a wooden or stone vessel with a tap at the base; this lets you draw off the clear juice without disturbing the settled solids.
Pour boiling water over the ripe blackberries until they're submerged. Once cooled, crush them thoroughly — your aim is to split every berry. Cover and leave at room temperature for three to four days. You'll know it's ready when the solids rise and the liquid underneath turns deep ruby. Draw off the clear juice through the tap into a fresh vessel. You should have a clean separation; if the juice is cloudy, wait another day.
Add sugar at the ratio of 450g per 4.5 litres of juice — this is your fermentable base. Stir to dissolve, then cover and let stand for six to ten days. The yeast (both wild and any you've introduced) will begin fermentation, producing alcohol and CO2. Once vigorous activity slows, strain the liquid through a jelly bag or fine cloth into a clean vessel. This removes the spent fruit and sediment.
For clarification, you'll use isinglass, a collagen derived from fish bladder. Steep 115g of isinglass in 570ml of the blackberry wine for twelve hours. Heat gently over a slow flame — do not boil — stirring until fully dissolved. This takes patience; isinglass will coagulate into grainy lumps if the temperature spikes. Pour the dissolved solution into a gallon of blackberry wine, stir well, and return it to your vessel. The isinglass will bind to suspended particles and sink, leaving the wine clear above.
Leave undisturbed for three to five days. The settled matter will form a compact layer at the bottom. Siphon or carefully draw off the clarified wine into a fresh vessel, leaving the sediment behind. Store in a cool, dark place — a cellar is ideal — where it will continue to mature and stabilise. The wine is drinkable within weeks but improves over months.
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