Hi Fiona
Sue is right, I use aubergine and also bamboo shoots as pasta substitute, BUT when you get a craving, nothing, but absolutely nothing will work you just have to have the real stuff, so I would suggest go ahead, weigh out that 2oz or whatever, have lots and lots of veggies with it and some creamy/fatty sauce and the damage wont be too bad at all, the cream/fat will help avoid a drastic spike and the veggies will kind of help turn it into a low GI meal, also drink a glass of red wine with it and really you should not go too high at all, once in a while you are allowed to do that, its about flexibility and you get back on track again afterwards.
I dont have carb cravings anymore at all, I have done this low/med carbing for such a long time, its really second nature to me now and even at Christmas or holidays I still dont go carb crazy, if I did have cravings I would give in just the once; but it has not always been like this, and I have found in the past that if I crave something really badly I will give in eventually anyway, and then I was ok again for quite a while, so dont put yourself through all the misery of craving and longing for something and dealing with substitutes, have a day off (or half a day off) and enjoy!
All the best
Karen x