Chop reserved re-hydrated mushrooms kept from making Hearty Vegetable Stock into half-inch pieces. Add mushrooms, broth, leeks, carrot, celery, potato, chickpeas, kale, and soy sauce to a large saucepan. Bring to a boil over medium-high heat, reduce to a simmer, and cook, stirring occasionally, until potatoes are completely tender and beginning to fall apart, about 25 minutes. Stir in cornstarch slurry and allow to simmer 2 minutes longer.
Step 2
Season to taste with salt and pepper, stir in lemon juice and parsley, and serve, drizzling extra-virgin olive oil into bowls as you eat.