Hey, what is the healthiest spread on a sandwich other than mustard? Not a fan of mustard. Lately, I've been trying cranberry but that is extremely high in sugar and calories (but then again, what spreads aren't?).
I just posted this in another thread but you can try using an avocado spread. Basically it's guacamole you make yourself (pre-made guac can have alot of salt & other crap that you don't want). Just get some avocado, mash up it with some chopped veggies and seasons to taste. Take a spoon full of it and spread it on a sandwich.
It adds fiber, and a healthy dose of good fats. Plus you'll get the added benefit of the veggies that you put in it.