French soup is not always onion soup imo.
I reserve this (and most of my friends also do the same) for after party meal, that is Onion soup is eaten at about 5AM after a lot of drinks with friends.
I was raised with vegetable soup, and I still eat this every day at dinner during winter time, rarely during summer.
You cook all your vegetables in a cocotte minute (pressure cooker) with hal, 3/4 water: potatoes, carrot, fast, green beans, and whatever other vegetable you like.
Once cooked, you manually mash them using a presse-purée (famous Moulinex potato masher). You keep your mashed vegetables in one pot, the liquid in another one.
When you warm up your soup in a pan, you can add some dried wheat little pasta
Laurent