Can I make my own superfine sugar?
Intuition tells me that caster/bakers'/superfine sugar is just granulated sugar put through a food processor. Am I wrong?
I just want something that'll melt a little more easily in cold drinks that require muddling of herbs and/or fruit(strawberry lemonade, mojitos, etc.) For other cold drinks I use simple syrup.
you are completely correct. dump it in the food processor & let 'er rip. i cover the processor with a towel as the sugar dust gets everywhere. i have cause to use superfine sugar a lot, and have found that it dulls the processor blade fairly quickly (doing a little for drinks now and then won't hurt it).
I keep some around all the time that I make with turbinado sugar in the blendor. I like the flavor of the turbinado, and it dissolves well without having the off taste of the anti-caking agent that is typically in commercial powdered sugar.
It's great for dissolving in drinks, although I see the point about wanting the crystals to abrade some herbs, fruit peels, etc. I typically really poke at those things even with the tines of a fork rather than just use a muddler, so it works out. It makes great lemonade and iced tea, as well as all those wonderful warm-weather cocktails. In winter, I put just a touch in the bottom of a shot glass that I then fill with bourbon to sip.
I also use it for sifting into whipped cream at the end, in making meringue, and ice cream. It helps the texture. One note, though, is that the lack of a bit of stabilizer found in off-the-shelf powedered sugar means that the whipped cream and meringue are more unstable and will fall quicker. I don't have any trouble generally, since I use a copper bowl for beating and have been known to sometimes add a bit of cream of tartar.