Juice the cherries (see notes), then stir the sugar into the juice until it's completely dissolved. Heating usually isn't necessary.
Stir in the acid blend, tannin and yeast nutrient, and pour the mixture into a narrow neck carboy.
Dissolve the wine yeast in a little water and let it bloom for about 10 minutes, then add it to the carboy.
Add water (or more cherry juice) to fill.
Cap with a water lock and allow the mixture to ferment for 1 to 2 weeks in primary until vigorous fermentation has slowed. If the mixture bubbles up into the water lock, remove it, clean it out and re-apply.
Rack the cherry wine into a clean carboy, leaving the sediment behind. Re-cap with a water lock and let it ferment another 4 to 6 weeks, or longer.
Bottle the cherry wine and let it age in the bottle for at least a month, or longer, before opening.
Notes
Juicing cherries: Left unpitted, cherries can go through a steam juicer (45 minutes to an hour), be frozen and then thawed (a few days start to finish), or be gently mashed with the sugar to pull their juice into a syrup, without damaging the pits (about 24 to 48 hours).Pitted cherries: If pitted, the cherries can go straight into a brewing bucket with the other ingredients and ferment there. Don't use a narrow neck fermenter for this, since it will clog. Open ferment in the bucket for about 5 to 7 days before straining out the cherries and carrying on with the ferment. If you're using just the juice, you can start in a narrow neck fermenter.Sweet or sour cherries: Black cherries have a more concentrated flavor, so I'd use 5 to 6 lbs (weighed whole) for a gallon of cherry wine. Sour cherries hold much more water, so use 6 to 8 lbs and add 1/2 pound more sugar. Sour cherries are also much more acidic, so you can skip the acid blend or add much less.Wine yeast: Most wine yeasts will work. Good choices are Lalvin 71B, Red Star Premier Classique (formerly Montrachet) and Red Star Premier Blanc.Yeast quantity: One packet of wine yeast is enough for anywhere from 1 to 5 gallons. The batch buttons on this card multiply the yeast along with everything else, so if you double or triple the recipe, still use just one packet.Fruit weights: A quart box of cherries from the farmers market weighs about 1 1/2 lbs.