What if a recipe calls for superfine sugar and you only have regular sugar?

Do you have a coffee bean/spice grinder? I had a recipe that called for caster sugar (which I never buy) and I ran some sugar through my grinder until it was fine enough. It worked great. If you don't have a spice grinder, you could probably do the same in a blender although it might take a little longer since there'd be more open space.

You can whirl the requested amount of sugar in a blender for a minute or so. I think the purpose for this ingredient in a recipe it that plain sugar may feel grainy in the eating of it.

for a meringue you need fine sugar. you can't use regular sugar but confetioners sugar works just fine.

blend reguler suger in the blender, thats all it is! if a recipe calls for icing suger blend 1 cup of reguler suger with 1 tsp corn starch :)

Use the regular sugar and sift it once or twice and you'll be fine.

Use the cheaper sugar... not everyone is a Professional chef.