I would tailor this recipe around the weight of the turkey you have as the sauce ingredients are simple and inexpensive, so it seems silly to have leave any meat to waste. Use this recipe as a guide using 500g of turkey, and work out your measurements accordingly. For example, 250g of turkey means halve the ingredients, 1lb and double it instead. Don’t forget to use the plain old taste test too. You can be a little relaxed with this dish.