You can just pour the soup, veg and all into a metal sieve. Then use the back of a spoon to press (you kind of swirl the spoon around pressing gently down) on the solids. It's how we used to make baby food when we couldn't be bothered breaking out the Mouli....you still see those for a pound or so in charity shops since most folks now use electric gadgets.
That's a baby sized one, mine takes a potful and sits over a pot to caw the handle.
Kilo HA49 Small Purée Mill/Mouli, for Making Homemade Baby Food and Puree Vegetable for Soups-Stainless-Steel. 13cm Diameter: Amazon.co.uk: Kitchen & Home
Great prices on your favourite Home brands, and free delivery on eligible orders.