Yum at fergus's recipe.
There is also a recipe in my Rose Elliot low carb cookbook using mascapone cheese, it didn't have a lot of effect on my blood sugar when I made it.
Tub of mascapone cheese, a little good quality instant coffee to taste - probably about 2 teaspoons, dissolved in water. The sweetener of your choice, to taste.
Mix it all together well, chill. 1 tub of mascapone will serve 2-3, depending on how big a bowl you serve it in.
I have also made this with chocolate instead of coffee - melt a few squares of minimum 70% chocolate, mix with the cheese and sweeten to taste.