Reduce boiling time by sticking your sap in a freezer, long enough so that its outer edges begin to freeze solid. The solid stuff is excess water; what remains is the sweet stuff you want. “You often average 2 percent sap, but this way you might be able to get it up to 4 or 5,” says Morse. “It may take only 10 gallons to make a gallon of syrup, not 40.”
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