scrambled home made soup doesn't need to be expensive. We do a tomato & lentil one that is really cheap...
Fry onion in oil (any type or butter) add crushed clove of garlic (optional), throw in carton of Passatta (35p at Aldi), crumble in a stock cube (or salt if you don't have a stockcube), add herbs (any type except sage works & they can be dried or fresh) water (about a pint ish .... ) a pinch of sugar (optional) and a scant dash of vinegar (optional but not without the sugar). Bring to theboil & add red lentils (about a handful). Grind in pepper to taste.
Or rude soup.... make stock from the carcase of a roast chicken (this one doesn't work from stock cubes). Fry up cubed vege from the compost heap that is the vege crisper add stock and simmer until vege are soft. If you are feeling posh add some pearl barley too. Finish with a handful of fresh herbs ( parsley or thyme works best). Or make it into Minestrone by adding a diced peeled tomato, rasher of bacon (both with vege) and beans / pasta toewards the end.
Onion soup... Slice up lots and lots of onions, fry really slowly until they turn golden brown (if you are using the oven for something spread them in a tray with butter and cover with foil - to start them off & save energy). When they are brown put in a good splash of vinegar and a spoon of brown sugar (or white if you don't have brown). fry for a couple of minutes to get a caramel happening. Add water and 2 beef stock cubes and a splash of white wine if you haven't drunk it while doing the onions ( this is my usual method). Simmer until the onions re falling apart. You can serve it with emmental cheese & garlic crutons.
Pea & ham .... fry onion & garlic, add a diced rasher of bacon or 2 or some ham or some such. Add lots of garden peas, stock cube ( half if the bacon is salty) and water.... simmer for a bit, blitz with a stick mixer.You can add creme fresh, sour cream or yoghurt to serve if you are expecting guests