Put berries, maple syrup (starting with 3 tbsp), vanilla, and salt in a saucepan over medium heat. Bring mixture to a slow boil, then reduce heat to medium-low and let cook for 15-20 minutes, until raspberries have softened and sauce has thickened slightly.  Taste, and add additional maple syrup if desired.  Serve sauce warm or cool (sauce will thicken more after cooling). Serve over “Divine Cheesecake”, p.. Makes about 1 1/2 cups.