You can buy it in supermarkets in a one-pound box, or make your own by processing sugar in a food processor fitted with a steel blade until the sugar grains are extremely fine.
(You; can buy; it; L:in supermarkets) (You; make; your own) (a food processor; fitted; with a steel blade) (the sugar grains; are; extremely fine)
You You a food processor the sugar grains
can buy make fitted are
it L:in supermarkets
your own
with a steel blade
extremely fine