Prepare a small canning pot and two half pint jars. Place lids in a small saucepan of water and bring to a bare simmer.
In a medium bowl, combine the raspberries and sugar. Using a wooden spoon, stir the sugar into the fruit, mashing the fruit up a bit as you go.
Once the raspberries begin to release some juice and the sugar is starting to dissolve, scrape the fruit and sugar mixture into a wide, 4-quart saucepan. Add the jalapeno.
Bring the jam to a boil over high heat, stirring regularly, until the berries break down and the syrup thickens. You should smell both the sweetness of the sugar and the heat of the chili.
Once the jam has thickened to a spreadable consistency and passes the plate test, add the lemon juice.
Remove pan from the heat and fish out the wilted jalapeno. Funnel the finished jam into jars, leaving 1/2 inch headspace. Wipe rims, apply lids and rings and process in a boiling water bath for 10 minutes.
When jars are cool, remove rings and test seals. Any unsealed jars should be stored in the refrigerator.
Serve this jam with fresh goat cheese or alongside cold meats.