Remove the pit and cut the peaches into fourths or eighths. The exact size isn’t important - mine were about 3/4” chunks.
2 pounds (907 grams) peaches
Combine the peach chunks, sugar or honey (1/3 cup for a lightly sweetened version or 1/2 cup for a more traditional sweetness) and lemon juice in a medium or large saucepan. The larger the surface area, the sooner your jam will be ready. Mash about half of the peaches with a potato masher.
3/4 cup (150 grams) granulated sugar, 2 teaspoons lemon juice
Bring to a boil over medium-high heat while stirring frequently. Once it starts boiling, turn the heat to the lowest you can to keep it at a full boil.
Let boil for about 12 minutes, turning the heat down, if needed, towards the end to prevent the peaches from burning, until it reaches a temperature of 220 °F (104 °C) for the sugar version or 227 °F (108 °C) for the honey version. It’ll still be a bit runny but will thicken as it cools and more as it’s chilled. From the time I added the peaches to the pan until they were done, it was 21 minutes total.
When you think the jam is ready, drop a small spoonful onto the cold plate and let it sit for a minute. Push it with your finger - if it wrinkles and holds its shape, the jam is done.
Remove the saucepan to a wire rack to cool completely, about 2 hours. Then refrigerate in an airtight container.
Yields about 1 1/3 cups (409 grams) of jam. Could be more or less depending on exactly how long you cook the peaches.