Place peaches, sugar and lemon juice in a medium pot (mixture should only take up about 1/3 of pot so it doesn't boil over). Squish the mixture with a potato masher or your hands.

Heat mixture to medium-high heat and bring to a boil. Lower to medium heat and boil on a medium rolling boil for 17-22 minutes.

Taste and adjust flavor as needed e.g. add a bit more lemon juice or sugar as you like. I sometimes add a small pinch of salt to bring out the brightness of the peaches.

Store the jam in jars according to one of the methods above.