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Birch syrup is a sweetener made from the sap of birch trees, and used in much the same way as maple syrup. It is used for pancake or waffle syrup, to make candies, as an ingredient in sauces, glazes, and dressings, and as a flavoring in ice cream, beer, wine, and soft drinks. It is condensed from the sap, which has about 0.5-2% percent sugar content, depending on the species of birch, location, weather, and season. The finished syrup is approximately 67% sugar. Birch sap sugar is about 42–54% fructose and 45% glucose, with a small amount of sucrose and trace amounts of galactose. The flavor of birch syrup is distinctive—rich and caramel-like, with a hint of spiciness.
Making birch syrup is more difficult than making maple syrup, requiring about 100-120 liters of sap to produce one liter of syrup (more than twice that needed for maple syrup). The tapping window for birch is generally shorter than for maple, primarily because birches live in more northerly climates. The trees are tapped and their sap collected in the spring (generally mid- to late April, about two to three weeks before the leaves appear on the trees). The common belief is that while birches have a lower trunk and root pressure than maples, pipeline or tubing method of sap collection used in large maple sugaring operations is not as useful in birch sap collection. However in the spring of 2012, Rocky Lake Birchworks, in The Pas, Manitoba, experimented with vacuum systems and pipelines and the collection method was a success.
The sap is reduced in the same way as maple sap, using reverse osmosis machines and evaporators in commercial production. While maple sap may be boiled down without the use of reverse osmosis, birch syrup is difficult to produce this way: the sap is more temperature sensitive than is maple sap because fructose burns at a lower temperature than sucrose, the primary sugar in maple sap. This means that boiling birch sap to produce syrup can much more easily result in a scorched taste.
Most birch syrup is produced in Russia, Alaska and Yukon and Canada from Paper Birch or Alaska Birch sap (Betula papyrifera var. humilis and neoalaskana). These trees are found primarily in interior and south central Alaska. The Kenai birch (Betula papyrifera var. kenaica), which is also used, grows most abundantly on the Kenai Peninsula, but is also found in the south central part of the state and hybridizes with humilis. The southeast Alaska variety is the Western paper birch, (Betula papyrifera var. commutata) and has a lower sugar content. One litre of syrup from these trees requires evaporation of approximately 130–150 litres of sap.
Total production of birch syrup in Alaska is approximately 3,800 liters (1,000 U.S. gallons) per year, with smaller quantities made in other U.S. states and Canada (also from Paper Birch), Russia, Belarus, Ukraine, and Scandinavia (from other species of birch). Because of the higher sap-to-syrup ratio and difficulties in production, birch syrup is more expensive than maple syrup, up to five times the price.