I used to buy packs of Soup Mix from any of the big supermarkets or from Approved Foods when it was on offer, and indeed I would again if there was a good offer on it. But one day when my jar was almost empty I had a good look at what was actually in the mix ... and discovered I had virtually everything it contained in the jars on my shelves already.
So I made myself a mix.
Oats, lentils (a mix of colours), split peas and barley are what I usually use. You just have to make sure that the things you mix together do not need soaking overnight and then rapid boiling, such as kidney beans ... if these weren't cooked properly you could make yourself seriously ill. All you need to do if you want to add something like this is deal with them separately when you come to make your soup.
You can turn this into a simple soup on it's own by just cooking it in a pan full of stock, or do as I do and add a handful of this mix to bulk out your vegetables or bottom of the fridge offerings.
It makes for a tasty and cheap pan full of soup for weekday lunches.
Today is a No Spend Day