Add the garlic, fry for a couple of minutes, then return the leeks and spinach to the pan. Put the silken tofu and soy sauce in a tall jug and add 3 tablespoons of the reserved pasta water.
Once it has softened, add the garlic and cook, stirring frequently ... Whisk a ladleful of the pasta cooking water into the egg mixture, then slowly pour it into the ’nduja and pasta mixture ...