This is real 'cucina povera', a simple dish made with humble ingredients and leftovers. Chop two red onions and sauté with a couple of tbsp of olive oil and some fresh thyme. Add 1 litre of vegetable stock and one or two crusts of parmesan cheese. Simmer until the onions and the parmesan crusts are soft.
At this point you can either remove the parmesan crusts and cut off the softest parts (to put back into the soup), or keep simmering the lot until the crusts are really really soft (you will need to add another half a litre of water). I usually use only the softest part and then cut the rest of the crust (which is a bit chewy) for the cats. Dogs also love it! Blend everything with an immersion blender and serve with some home made bread!
Photos and Recipes by Alessandra Zecchini ©