Cook your pasta in boiling water. For the last 5 minutes add the kale and mushrooms.
Drain the beans in a colander. When cooked, drain the pasta and veg by pouring on top of the beans. Add everything back to the pan.
Pour the passata onto the pasta mixture and heat through. If there is too much water in there then boil it off or add a squirt of tomato purée. Next season with garlic granules, Italian seasoning, salt and pepper. Stir through the walnuts and serve.