Leeky sausage soup. About an ounce/25g butter. One large onion, chopped, two or three large leeks, trimmed and sliced. Some oil to hand. Boiling water. A decent size potato (one out of the baking size bag usually does nicely), chopped skin on to about an inch/2 cm chunks. Bay leaf, sprig thyme, or bouquet garni if you've got one kicking about.
To serve, continental smoked sausage like bockwurst, sliced; grated cheese for the vegetarian child, crusty white bread and butter. Salt and pepper to taste.
Melt butter in a big saucepan. Add onion and leeks. Stir around until they're starting to go translucent. Add a bit of oil if it looks like they're going to burn instead. Add the potato chunks, stir around a bit, add boiling water to cover, add herbs/bouquet garni, stick lid on, turn to very low simmer, set timer to 10 minutes, bugger off and do something else.
When timer goes off, give it a good stir, add a bit of boiling water if it looks like it's going to burn dry, turn oven on if you're doing part baked bread. Set timer for another ten minutes.
When timer goes off, give it another good stir, put p/b bread in oven if using, set timer again for whatever it says on the p/b bread instructions or ten minutes. Chop up the sausage and/or grate the cheese if you haven't done it already.
To serve -
For the meat eaters, place a handful of sliced sausage in bottom of a big bowl each and give it 30 seconds in the microwave. Then a dollop of soup.
For the veggies, big handful of grated cheese on top of the served soup.
For me, that loves both, both...
Both cheese and sausage have their own salt, so only offer salt (and pepper) if they ask for it, after tasting it.
*This rule applies to pretty well everything!