Press the apples using a cider press to extract the juice.
If desired, refrigerate the juice for 24 to 48 hours to allow sediment to settle. Ladle the clear juice into a large stainless steel saucepan, discarding the sediment.
Prepare your canner, jars, and lids. The canner should be preheated for hot pack, and the water should be simmering at around 180 to 190°F (82 to 88°C).
Heat the apple juice in the saucepan or stock pot to 190°F (88°C) over medium-high heat, avoiding boiling. Keep it at this temperature for 5 minutes, then turn off the heat.
Measure 1 Tbsp of bottled lemon juice into the bottom of each quart jar. (Or ½ Tbsp for pints, or 2 Tbsp for half gallons).
Ladle the hot juice into hot jars, leaving a 1/4 inch headspace. Wipe rims, center lids, and screw down bands to fingertip-tight.
Process the jars in a boiling water canner for 10 minutes (adjust for altitude as needed; see notes). After processing, remove the lid and let the jars sit for 5 minutes before removing them. This extra time helps prevent siphoning and thermal shock on the jars.
Cool the jars completely on a towel or rack and check seals before storing.