No worries! If you can’t find Caster sugar, or you just don’t have caster sugar at your house currently, you can use granulated sugar instead. We just need to grind the granulated sugar a tad bit, so the granules are the right grit for this recipe. To do that, You can use a coffee grinder, food processor or blender. Whilst grinding, make sure you don’t grind it to a powder-like density. Keep in mind, we’re aiming for something that falls between granulated and powdered sugar.