Raspberry Jam

In a medium saucepan over medium heat, combine raspberries, sugar, and lemon juice. Cook, stirring frequently, until mixture is boiling. Reduce heat to medium-low and simmer, stirring frequently. Cook until mixture has thickened and leaves a trail behind your spoon when you stir. This should take somewhere between 12 and 15 minutes. When jam has thickened, remove from heat and transfer to a clean glass jar. Let cool completely before covering and refrigerating.