Instead of sugar I use splenda and I also change to lime juice if I don't have lemon. But this is a good old standard. And kick it up once in awhile with some garlic or other simple spice.

It is good with orange juice too !!!

I use agave nectar, veganaise, lime juice and then add about a teaspoon of traditional Dijon Mustard and a 1/2 teaspoon of salt.