Granulated sugar is the workhorse of the kitchen. It’s the stuff you dump into your coffee or bake into basic cookies. Its crystals are medium-sized, sturdy, and a bit stubborn about dissolving.
Caster sugar, on the other hand, is granulated sugar’s more refined, slightly flirtatious sibling. It’s ground to a finer texture—think sand versus tiny gravel. It dissolves faster and more evenly, which makes it the secret weapon for light, airy desserts.
(Side note: If you’re in the UK, you call it “caster sugar.” In the US, it’s often labeled “superfine sugar.” Same stuff, just with an identity crisis.)
Why your sponge cake cares (and you should too)
Baking is chemistry with a side of delicious anxiety. When you cream butter and sugar for a cake, the granules act like tiny knives, cutting air pockets into the fat. Bigger crystals from granulated sugar can’t do this as smoothly, leaving you with a denser crumb.
Caster sugar’s smaller particles create more air pockets—which means a fluffier, lighter sponge. Ever wonder why professional bakeries have that cloud-like texture? Yeah, it’s not magic. It’s just finer sugar and a whole lot of patience.
Granulated Sugar Vs Caster Sugar What Is Caster Sugar And How To Make
But here’s the irony: you might already own caster sugar without knowing it. If you’ve ever whizzed regular granulated sugar in a food processor for a few seconds, congrats—you’re a DIY sugar alchemist. (Just don’t turn it into dust, or you’ll accidentally make powdered sugar. Been there. It’s not the same.)
