This is lovely! Cool some onion and leek in butter while roasting some Kohl Rabi and Patatoes (we just did it in air fryer). Add carrot, small red pepper, green beans, sprouts (basically a bit of all left over bits from cupboards and garden. Add cooked potatoes and Kohl Rabi, then add some stock (400ml?) and milk (500ml? - depends on amounts of veg).
add a couple bay leaves and cook for a while then whizz up!