Step 4 of 11 · Jam, Fruit Salad, and Fresh Juice in One Afternoon
Rolling boil and wrinkle test
Rolling boil and wrinkle test — step 4 of 11 in Jam, Fruit Salad, and Fresh Juice in One Afternoon. Medium-high heat. Stir so the bottom does not catch. Skim foam if you want clearer jars — optional.
Free food & cooking tip: Rolling boil and wrinkle test (step 4 of 11 from "Jam, Fruit Salad, and Fresh Juice in One Afternoon").
Medium-high heat. Stir so the bottom does not catch. Skim foam if you want clearer jars — optional. When bubbles are thick and slow, you are close — usually 8–12 minutes of hard boil after it first rolls.
Drop half a teaspoon on the frozen plate, wait 20 seconds, push with a finger. Wrinkles and stays parted = done. Floods back = boil 2 more minutes and test again. Thermometer backup: 105°C / 221°F at sea level.
Pro tip: Stir the corners of the pot — jam catches there first and tastes like burnt caramel.
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