As New England’s maple sap started to drip in March, David Moore of The Crooked Chimney sugarhouse in Lee, N.H., counted the days until it would stop flowing. Right about the time the maples are tapped out, Moore collects a less sugary sap from slender, white paper birch trees.
Moore, one of the only known commercial birch syrup producers in New England, says his reddish-brown syrup tastes like a mild, slightly acidic molasses with a hint of raspberry. The viscosity at room temperature is slow, albeit a bit quicker than molasses. Its unique taste makes it well suited as an ice cream topping (Moore’s favorite); a glaze, salad dressing or braising liquid ingredient; and an intriguing baked goods sweetener.
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In addition to its uses in the kitchen, birch syrup has high market values that could help maple syrup producers supplement future revenue streams in a sustainable fashion, according to researchers at Cornell and the University of Vermont. Its production relies on many of the techniques currently employed in making maple syrup, and birch trees are in rather good supply in the Northeast.
Birch syrup is not entirely a novelty in North America. Native Americans for centuries used it as an anti-rheumatic. Twentieth-century Alaskans also tapped it to fill gaps in wartime sugar supplies, and birch syrup production has become a cottage industry there. Still, last year’s 5,000 gallons of domestically produced birch syrup were just a drop in the bucket compared with the 3.25 million gallons of maple syrup produced.
Chef Evan Mallett of Black Trumpet bistro in Portsmouth, N.H., says Moore’s syrup has a rich, deep and slightly resinous quality that makes it suitable as a finishing syrup and a glaze for grilled chicken or pork. Mallett’s seasonal menu features brioche Texas toast, a thick slice of house-made bread stuffed with roasted mushrooms and cheese and served with huitlacoche (fungus that grows on ears of corn) butter, candy cap mushroom oil and a few drops of birch syrup.
“I like it on pancakes too, but it’s pretty expensive to slather on,” Mallett said.
The going rate for a quart of birch syrup is $78, compared with $10 for Grade A maple syrup. The selling price is very attractive, said Moore, who last year charged $25 for 8-ounce jars and sold out by the end of May. Moore sells his product at a half dozen locations in New Hampshire and will be taking some mail orders this year if supplies last.
“Making birch syrup takes more energy than making maple syrup,” explained Moore, who collects 100 to 120 gallons of sap (he typically gets about 5 gallons a day from each of his 170 taps) to make one gallon of birch syrup. Maple syrup requires only 40 gallons of sap per gallon of syrup.
Abby van den Berg of the University of Vermont’s Proctor Maple Research Center said the profitability of birch syrup production in the Northern Forest — the region that stretches from Maine through northern New Hampshire and Vermont into northern New York — in the past has been limited due to the fact that the low sugar content of birch sap (about 1% compared with 2% in maple) means producers need lots of evaporator fuel to concentrate the sap to syrup density.
But she argues that reverse osmosis, a process used in Alaskan birch syrup production that concentrates sugar densities (to 8% or greater) in the sap before it goes into the evaporator mitigates that hurdle. Modern sap collection techniques such as using a vacuum also help to increase the sap collection during the short three- to four-week birch sap season.
Moore has considered using reverse osmosis, but he currently processes sap in a 3- by 12-foot double-panned evaporator inside the wooden sugar shack he built himself. He uses a team of draft horses to help haul the firewood (ash, hickory, maple and oak) needed to fuel the evaporator. The new reverse osmosis machine would require him to run power to the sugarhouse. He estimates adding reverse osmosis would cost $7,000. “It could be a tough sell for me,” Moore said.
Neither van den Berg nor Michael Farrell, director of Cornell Sugar Maple Research & Extension Program’s Uihlein field station in Lake Placid, N.Y., could provide more than anecdotal evidence that maple syrup producers are clamoring to make birch syrup.
At a maple syrup taste test he conducted for maple syrup producers earlier this year, Farrell threw birch syrup into the mix. When he asked for a show of hands from those who liked the taste of New England birch syrup, not one went up. The producers then were offered a taste of birch syrup made with reverse osmosis. “Nearly everyone changed their mind,” Farrell said.
“This altered process gives birch syrup a wider range of flavor that should appeal to more people. They’ve just got to be willing to taste it,” he said.
Chewy Ginger and Birch Syrup Lumberjack Cookies
Yes, birch syrup is expensive, but it adds an interesting twist to these spicy chewy cookies that people won’t place until you tell them. Think of it as money well spent for tea time conversation.
Makes 24 cookies
2¼ cups all-purpose flour
2 teaspoons baking soda
2 teaspoons ground ginger
1 teaspoon ground cinnamon
½ teaspoon mustard powder
½ teaspoon allspice
½ teaspoon salt
¼ teaspoon black pepper
¾ cup unsalted butter (1½ sticks), room temperature
¾ cup packed light brown sugar
1 large egg
½ cup birch syrup
⅓ cup finely diced candied ginger (optional)
Granulated sugar for rolling
1. Preheat oven to 375 F. Line two large baking sheets with parchment paper.
2. Whisk together flour, baking soda, ground ginger, cinnamon, mustard powder, allspice, salt and black pepper.
3. Beat butter and sugar together in bowl of electric mixer until light and fluffy, 3 minutes. Add egg and birch syrup. Mix to combine well. Stir in dry ingredients. Stir in candied ginger, if using. Refrigerate the dough for 30 minutes.
4. Roll dough into 1½-inch balls and then roll them in the raw sugar. Arrange on the baking sheets and gently flatten them with the bottom of a flat glass. Bake until set and crinkled on top, about 12 minutes.
Let the cookies sit on the baking sheet for 2 minutes and then remove them to a rack to cool completely.
Top photo: The Crooked Chimney sugarhouse where Lee, N.H., resident David Moore boils down paper birch sap to make birch syrup. Credit: Christine Burns Rudalevige