Making one small change at a time can make becoming eco friendly loads easier. Lots of small changes add up to a big difference.
You just pour the sauce into a container (I used a little roasting tray, but you could use a pyrex dish or something similar) and put it in the freezer overnight. Take it out the next day and cut the frozen sauce into whatever size is the correct portion size for you. Pop the sauce portions into jars and store in the freezer, ready to chip out a block or two when you need it.
Don't forget to check out my other small changes to help you live a greener life!