Prepare ahead. You can make this sauce up to two days ahead of time, keep it in the fridge and then gently reheat it when you're ready to serve.
Want to make it even lower carb? Try making it with unsweetened soya milk for an even lower carb sauce - just 1.5g per serving! Make sure you taste your sauce though. Soya milk is naturally a little sweeter than cows milk so you may need to add a little more seasoning.
Help! My sauce has split! Don't worry! This is a high fat sauce so they have a tendency to split if they get too hot. If this happens to you, just pop the sauce into a blender (or use a stick blender if you have one) and whizz it back together again. Make sure you keep it on a low heat as you warm it up to serve.