It's easy, all you need is:
1/2 litre stock
1/2 kilo assorted veg
and 250/500 gms your choice of meat/fish/poultry
herbs/spices/S&P to taste
Chop the meat, if any, into chunks and brown it in a little oil (if it's not left overs that is), put the stock in a pan and bring to the boil then throw everything in and cook at a simmer till the veggies are soft. Liquidise the results and serve you'll never know there's veg in there. It's enough for two and freezes well. I use whatever leftovers are handy, it saves waste.