Mine is a faff admittedly, but it makes several dinners and has loads of vegetables hidden for fussy dc. I make a big batch of tomato sauce:
3 cartons passata
3 tins cherry tomatoes
1/2 head of celery
2 large brown onions
2 large red onions
6 carrots
2 whole heads of garlic
2 red peppers
1 large courgette
1/2 bag spinach
While cooking a different dinner, I slowly brown the onions. Gently, but to brown. Then I add the garlic, roughly chopped, skins and all, carrots , grated, celery roughly chopped. I let that simmer slowly. SomeI even turn that off and stick it in the fridge when cool to pick up next time I cook.
At that stage, I add all the other veg, except tomatoes and sweat it all together a while. Until the courgettes start to break down. Then add tomatoes. I simmer for about an hour, or slow cook for 4 hours on low and then blend it. Then I simmer it again to get it super thick, just so I can freeze it in smaller bits. I use a wee ikea bag that is just the right quantity for a dinner for 4. I also fill a couple of tiny tubs, which end up as pizza topping.
So, each bag might end up a curry, pasta dish etc and used for different meats or paneer, or a vegetable dish. It is just a super base. I usually have at least 4 dinners worth from this after I make my bolognese.
To make it bolognese, I brown off a wee pack of pancetta, then add 500g 5% fat beef mince and 500g pork mince and brown that a little. I crumble in a beef stock cube, add half a cup of red wine, but you can skip obviously. I add 1 cup of milk and simmer v low. I add about 3/4 sprigs each of fresh (or frozen) rosemary, thyme, marjoram and oregano. A wee bit of shredded basil leaves. A teaspoon each of dried oregano, thyme and basil. I taste that out rather than measure tbh. Then I simmer it all for at least an hour.
Sometimes I do it over 3 days, just doing bits around other things, but it tastes fab and we get a load of wee tomato sauce bags in the freezer for future meals, plus 4 lots of meat for spaghetti bol, lasagne etc for the 4 of us.