I start by peeling, pitting, and roughly chopping all my peaches into smaller chunks. If the skins are being stubborn, I dunk the peaches in boiling water for under a minute, then into an ice bath, which makes the skins slide right off. This step takes a little patience, but it makes the rest of the process go so much faster.
I add my chopped peaches and fresh lemon juice into a medium saucepan and bring everything up to a boil over medium-high heat. As it heats, I use my masher to crush the peaches down to the texture I want, whether that's smooth or a little chunky. This is where the kitchen starts smelling incredible.
Once the peaches are boiling and broken down, I lower the heat slightly and stir in all of the sugar. I bring the mixture back up to a full rolling boil, stirring often so it doesn't stick or burn on the bottom of the pan. This part needs a bit of attention, but it moves fast.
I let the jam boil and reduce for about 15 to 25 minutes, stirring regularly the whole time. I know it's close to ready when it coats the back of my spoon in a thick layer instead of running right off. A thermometer reading of 220°F is my go-to signal that the jam will set.
Once the jam looks and feels right, I pull it off the heat and let it cool slightly before spooning it into clean jars. I leave the jars out until they've cooled to room temperature, then pop them in the fridge so the jam can fully set up over the next day or so.