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Caster Sugar
Clean, neutral, and purely sweet — caster sugar has no flavor of its own beyond sweetness, making it ideal for preparations where the sugar is a structural ingredient rather than a flavor contributor. Golden caster sugar adds the faintest hint of caramel warmth.
Lens analyzedCaster sugar (also spelled castor sugar and known as superfine sugar in North America) is white granulated sugar milled to a significantly finer grain than regular table sugar. The smaller crystals dissolve almost instantly, making it the preferred sugar for meringues, mousses, cold drinks, and any preparation where undissolved sugar granules would be noticeable. It is the standard sugar called for in most British and Australian baking recipes.
Where it comes from
Caster sugar takes its name from English sugar-dusting shakers and has been the standard baking sugar in British culinary tradition since the Victorian era.
Varieties — Golden caster sugar is an unrefined version with a pale golden color and a subtle caramel or honey note from retained molasses. Standard caster sugar is white and neutral. Both behave identically in baking.
In British and Australian baking, caster sugar is simply called 'sugar' — it is the baseline. Recipes from these traditions that call for 'sugar' almost always intend caster sugar rather than the coarser American granulated sugar. This distinction trips up many home bakers working across culinary traditions.
In a modern kitchen — The rise of British Bake Off-influenced home baking globally has increased awareness of caster sugar as a specific ingredient. Many North American bakers now keep a bag of superfine sugar specifically for meringues and sponge cakes after discovering that regular granulated sugar produces grainier results.
Buying it
Caster sugar is widely available in British, Australian, and New Zealand supermarkets. In North America, look for 'superfine sugar' or 'baker's sugar' in the baking aisle or specialty stores. In a pinch, regular granulated sugar can be processed in a food processor for 1–2 minutes to approximate the finer grain. Golden caster sugar offers a subtle depth of flavor worth seeking for certain applications.
Storing it
Keep caster sugar dry in a sealed container in the pantry. If it hardens into clumps, it's just picked up moisture — break it up or sieve it rather than treating it as spoiled.
Keeps about 1 year in the pantry.
Out of caster sugar? Good swaps
General cooking guidance — always check the labels on the products you use. Listahan’s allergen checks run automatically when you plan a recipe in the app. Not medical advice.
Recipes that use caster sugar
Common questions about caster sugar
Is caster sugar vegan?
Caster Sugar is generally plant-based and suitable for a vegan diet, but brands differ — confirm on the label.
What can I use instead of caster sugar?
Good swaps include , . Each behaves a little differently — see the swaps above for notes, and always check labels for allergens.
How do I store caster sugar?
Keep caster sugar dry in a sealed container in the pantry. If it hardens into clumps, it's just picked up moisture — break it up or sieve it rather than treating it as spoiled. It keeps about 1 year in the pantry.
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Make caster sugar about your kitchen — with Listahan Pro
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Checked for each member
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Pantry-aware
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What it costs near you
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Your household memory
Who likes it, plus your own private notes — brand, where you keep it, who skips it.
Allergen safety is always free — Pro adds the automation, never the safety.
Cook with caster sugar — safely
Plan a recipe in Listahan and the household allergen check runs automatically — every plan, every swap, every lunchbox. Safety is never paywalled.