Apple Butter

Steps

1. peel30 min
   thin slices
   apples, peeled and cored, sliced thin — peel when the butter is going into jars, both to cut contamination risk and because skins left whole never fully disappear; thin slices collapse hours sooner than chunks
2. stew240 min
   slow cooker, low, covered
   apple slices + water + cider vinegar — barely any liquid is needed because the fruit gives up its own; the vinegar is for brightness and keeps the long cook from tasting flat
3. mash5 min
   until no slices remain
   softened apples, mashed or immersion-blended smooth in the crock = applesauce stage, the baseline you reduce from. Blend before sugar goes in so you can taste the actual sweetness of your fruit
4. season3 min
   off the heat, tasting
   + sugar + brown sugar + cinnamon + cloves + salt, stirred in fully. Unlike jam, nothing here depends on sugar for set, so cut it to half a cup if the apples are sweet or push to two cups if they are sharp — it is a seasoning decision, not a structural one
5. reduce420 min
   low, lid propped ajar, stirring hourly
   sweetened puree, cooking down until it darkens from tan to deep mahogany. The propped lid is the whole mechanism: a sealed crock recondenses its own steam and the butter will never thicken no matter how long you run it. This long stretch of low heat is also where the caramelization happens — the fast stovetop version thickens but stays pale
6. mix2 min
   doneness test
   lift a spoonful clear of the steam — it should stay mounded, not slump — and drop a dab on a cold plate; if a rim of watery liquid weeps out around it, keep cooking. There is no set point to hit and no gel to break. Runny apple butter is not failed apple butter, it is unfinished apple butter
7. can25 min
   boiling-water canner, jars and butter both hot
   hot butter ladled into hot jars, quarter-inch headspace, bubbles run out with a spatula, rims wiped clean, lids fingertip-tight. Process at a full rolling boil: 5 minutes for half-pints and pints, 10 for quarts, adding time for altitude. Many published recipes say 10 or 15 minutes — longer than tested guidance, and harmless, so err long if unsure. A greasy rim is the usual cause of a failed seal
8. rest5 min
   heat off, canner lid removed
   jars in the water, undisturbed, before lifting — moving them straight from boil to counter shocks the contents and can siphon butter past the lid
9. store15 min
   12 to 24 hours untouched, then check seals
   cooled jars, lids pressed at the center; a lid that flexes or clicks did not seal and belongs in the refrigerator. Do not retighten rings while cooling — that traps air and defeats the vacuum