A thick, neutral glucose syrup made by breaking down cornstarch. It is less sweet than sugar and, critically, resists crystallising.
What it does in a recipe: Interfering sugar — it keeps caramels chewy, icings glossy and sorbets smooth by blocking sucrose crystals from forming. Pick the swap that covers that job — the ratios below are written so you can act on them without doing any arithmetic.
Also called: Corn syrup, Karo syrup
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Glucose syrup
1 cup light corn syrup = 1 cup glucose syrup
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5 ways to replace light corn syrup
Glucose syrup
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1 cup light corn syrup = 1 cup glucose syrup
Functionally the same product sold under a different name in much of the world, with the same anti-crystallising behaviour and neutral flavour.
MethodConfectioner's glucose is stiffer than corn syrup. Warm the jar in hot water for a few minutes so it pours and measures accurately.
Trade-offNo practical difference in the finished sweet.
1 cup light corn syrup = 1 1/4 cups granulated sugar + 1/4 cup water
This matches the sweetness and bulk, but sucrose alone will happily crystallise, so a trace of acid is needed to invert some of it during cooking.
MethodAdd 1/4 tsp cream of tartar or 1 tsp lemon juice and heat until fully dissolved, brushing the pan sides down with water so no stray crystals seed the syrup.
Trade-offSweeter than corn syrup and far more prone to graining. Acceptable in a pie filling, risky in fudge, caramel or anything that must stay glossy for days.
Light corn syrup and high-fructose corn syrup are different products; the retail bottle in the baking aisle is the former. Dark corn syrup is light corn syrup with molasses and caramel added, and is not interchangeable where colour matters.
Cooking around an allergy? Diet tags here describe the ingredient itself, not any particular brand. Processed products change formulation without notice and shared production lines are common, so read the label on everything you use. A severe allergy is a medical matter — confirm with the manufacturer or your clinician rather than relying on a substitution chart.