This is so fast and always a hit at my house. I don't think there's an easier recipe for BBQ sauce than this one! Plus, no white sugar if you're careful with the tomato paste you buy (I make sure the tomato paste I buy is 100% tomato, you really have to check the ingredients).
1/3 part tomato paste
1/3 part tamari (or soy sauce)
1/3 part selon (date honey) or other sweetener (like maple syrup or agave)
Stir it together well and brush or drizzle over your meat or fish. This will keep well in your fridge for days. If you're not going to use the whole batch you make remember to be careful about keeping any sauce "clean." By that I mean don't re-dip your brush or spoon into the sauce once it's been used on raw meat, chicken, or fish.
You can make this in a small quantity of 1/3 cup each. Or, if you're having a big bash or want to have some ready in the freezer by making portions, you can just up the measure to a cup or more, what ever will serve your needs.