Mix 2 glasses of red wine, one of vinegar, 3 teaspoonful of cullis, a bit of sugar, 1 sliced onion, a little cinnamon, and a laurel-leaf; boil them a quarter of an hour.
... equation is now in a form in which we can conveniently complete the square[?]. To "complete the square" is to add a constant (i.e., in this case, a ...