Apparently it takes ten hours to cook properly.
The Sun
Perhaps it would be the perfect time to learn to cook properly.
The Sun
Make sure the temperature of the oil doesn't drop, because your churros will not cook properly.
Times, Sunday Times
They won't cook properly if they overlap.
Times, Sunday Times
Several pancakes may be cooked at any given time, but each piece must be submerged under the oil in order to cook properly.
Retrieved from Wikipedia CC BY-SA 3.0