I weigh the stuffing when it's cooked, yeah.
You could also use a Hex B for some roast potatoes - 227g chopped up with the skin on, or I usually chuck 198g of new potatoes in the oven to make little roasties.
Yorkshire puds are surprisingly low syn as well, think it's about 2 or 3 syns for the frozen ones? I make my own which work out at about 3 each if I remember rightly.