Actually very easy

Icing sugar

The beliefIt is treated as a separate product you have to go out and buy.

The truthIcing sugar is granulated sugar, ground. That is the entire difference.

1 minute

How to make it

What you need

1 cup granulated sugar
1 teaspoon corn starch

How the engine read this list (2 lines)

170 g	Granulated sugar	sugar
6 g	Corn starch	starch

An empty weight means that line could not be turned into grams — either the amount is open ("to taste") or the ingredient has no record here. Neither enters the sum as zero; they do not enter it at all.

Put both in a dry coffee grinder or a strong blender.
Run it for 30–45 seconds, shaking it once or twice.
Let the dust settle for a minute before opening, then sift.

Why it works

The only difference is particle size: granulated sugar is about 0.5 mm, icing sugar under 0.01 mm. Smaller particles dissolve instantly on the tongue, which is why a buttercream made with it never feels sandy. Shop-bought icing sugar carries 2–3% starch — not for taste, but to hold moisture and stop caking. A teaspoon of starch per cup of sugar at home gives you exactly the same thing.

The rough sum

176 grams going in

681 kcal in total

100% of the mass has figures behind it. This is the sum of what GOES IN rather than of what comes out. Wherever something evaporates, drains or ferments the two differ: a kilo of milk is 150 g of cheese.

Diets it qualifies for

Gluten-free · with care Vegan Vegetarian Lactose-free

Storage & shelf life

How long it keeps

With starch, in an airtight jar: 6 months
Without starch: Use the same day
Fridge: Never — condensation makes lumps

Sugar does not spoil; the only enemy of icing sugar is moisture, and the starch is there precisely to hold it. Keep the jar away from the steamy corner of the kitchen, off the hob and off the dishwasher. If it lumps, do not bin it — push it through a sieve and most of it comes back.

When to bin it If it has set into one solid rock that will not go through a sieve, let it go: the moisture that got in may have brought company.

History

Where it comes from

Grinding sugar is as old as sugar itself. When cane sugar reached Anatolia from India by way of Persia it came as a solid cone — breaking up that *kelle şeker* and pounding it in a mortar was routine kitchen work, and granulated sugar did not exist as a product. The starch in a modern packet is a nineteenth-century fix: icing sugar draws moisture from the air and clumps, and the starch takes that moisture on itself instead. What is in the packet is not pure sugar but pure sugar plus a desiccant.

The knack