You can't beat a good cauliflower cheese. You need to use the whitest and freshest cauliflower though! My daughter didn't want too much mustard in it so this is why we ended up using just half a teaspoon. To be honest this gives a more subtle taste. We usually have this with mashed potatoes, steamed carrots or cabbage. You can even use little portions of it on your main Christmas dinner.
Here is the recipe