☞ TESTER TIP: To easily gauge when your mixture has reduced by 1/3, use a wooden skewer or popsicle stick as a depth gauge. Simply stick it in the pan at the beginning and make a notch at the depth of the liquid. Then, as you boil the mixture to reduce it, take the pan off the heat every 5 minutes or so to let the bubbles calm down and check the depth, continuing on until sufficiently reduced by about a third according to your measuring stick.