In a small pot, heat all ingredients over medium-low heat for approximately 3-5 minutes, stirring frequently to ensure it doesn't stick to the bottom of the pan. The raspberries should start breaking down on their own, but you can assist them by using a cooking spoon to break them down further.
Turn off the burner and let sit for 5 minutes to thicken up.
Notes
Store in a mason jar with a tight-fitting lid or an air-tight container in the fridge for about 1 week!