Maple sugar, molded candy and sugar on snow: the temperatures

Every maple confection is the same trick: cook syrup past syrup density, then control how the sucrose crystallizes. Stir it hot and you get big crystals (granulated sugar). Cool it undisturbed, then stir, and you get the tiny crystals of cream and molded candy. Cool a very dense syrup fast without stirring and it sets as a glass (sugar on snow and taffy). What changes from product to product is the finish temperature, always given as degrees above the boiling point of water measured that day.

Weather, barometric pressure and elevation all move the temperature water boils at, and every confection target moves with it. So the manual says to determine water's boiling point before making any confection: bring a pot of water to a hard boil, read it with the thermometer you will use, and add the target. The thermometer should cover 200 to 300 °F and read to 0.5 or 1 °F. Our finishing temperature tool covers the same measurement.

The other control is invert sugar, the glucose and fructose in syrup. Because invert does not crystallize like sucrose, higher-invert syrup needs a higher finish temperature to reach the same sucrose concentration, and too much invert can stop crystals forming at all. Cornell's notebook measures it with a blood-glucose meter: dilute 1 part syrup in 10 by weight, read mg/dL and multiply by 0.02 for percent invert. The full procedure is in the maple cream guide.

The soft, opaque leaf-shaped candy. The two 2022 references do not quite agree on the target: the Producers Manual says 32 to 34 °F above water's boiling point; Cornell's notebook says 28 to 34 °F. The Massachusetts Maple Producers Association's recipe sits at 32 °F. The notebook wants syrup with 0.5 to 1.5% invert, under 0.7% ideal.

1. 1

   Measure water's boiling point, then cook

   Add the target to today's reading. Cook in a pot with headroom; confection syrup foams over and scorches easily, and scorched syrup can catch fire.
2. 2

   Cool to 160 to 200 °F

   Take it off the heat and let it cool, undisturbed, into this range. The stirring temperature sets the hardness: about 200 °F for hard candy that will be crystal-coated, 175 to 190 °F for medium, below 170 °F for the softer candy most people prefer.
3. 3

   Seed and stir

   Seed with a spoon of finished maple cream and stir until the syrup lightens and turns opaque.
4. 4

   Pour into molds at 150 to 175 °F

   The notebook fills molds between 150 and 175 °F; the manual notes that cooling to about 150 °F before filling gives far fewer white spots. Wash rubber molds in very hot water only, never soap, which carries over into the flavor.
5. 5

   Optional: crystal coat

   A glossy shell keeps molded candy moist. Soak the candy in a supersaturated solution made by heating low-invert syrup to 9.5 to 11 °F above water's boiling point (70 to 73 °Brix).

A firmer cousin is fondant-style candy: made like cream but heated to 27 to 29 °F above water, cooled to 100 °F and stirred. It sets harder because less water remains.

Granulated (stirred) sugar is cooked to 50 to 70 °F above water's boiling point, higher for higher-invert syrup (closer to 2%), lower for low-invert syrup. Stir it immediately for coarse, brown-sugar-like granules, or let it cool to about 200 °F and stir by machine for a finer, powdery sugar, then sift to size. Low-invert syrup tends to make a grainier sugar; high-invert makes a finer, more powdery one.

Hard block (cake) sugar is cooked to 34 to 38 °F above, the lower end for a softer, candy-like product and the upper end for large hard blocks. Pull it from the heat the instant it reaches temperature and stir vigorously. Some let it cool to 210 °F first, which the manual does not recommend. Near the target it can get too hot very quickly, so watch it.

Sugar on snow (jack wax) is the one product you do not stir. Cornell's notebook heats syrup to 23 to 26 °F above water's boiling point for taffy, lets it rest a few minutes undisturbed, then pours it. For sugar on snow the manual describes pouring ribbons of the hot candy onto clean, fresh snow or crushed ice without stirring, so it sets as a chewy glass instead of crystallizing. The final temperature, the notebook says, depends on preference: boil a few degrees higher for stiffer, lower for chewier and softer.

Cornell's notebook gives the conversions from a gallon of syrup, which weighs about 11 pounds. Figure about one hour of work per gallon converted.

The sources say the most about granulated sugar: it has no available water, so it will not separate or mold, and keeps indefinitely at room temperature in moisture-proof packaging. Hard blocks stored at low humidity can dry, harden and show white spots on the surface, so keep them in dry, airtight packaging.

For molded candy the only storage guidance we found is the crystal coating itself, the shell that keeps the candy moist. The sources we read give no shelf-life figure for candy or sugar on snow, so we are not inventing one. Maple cream is a refrigerated product, covered in its own guide.