Prepare all ingredients as listed above.
In a small saucepan, combine water and kombu over medium heat. Warm for about 5 minutes, then remove kombu just before boiling.
Add celery, broccoli, carrot, and garlic to the hot broth. Simmer for 3–4 minutes until slightly tender.
Stir in chickpeas and tofu. Simmer for another 1–2 minutes.
In a small bowl, dissolve the miso paste with a few spoonfuls of hot broth. Stir back into the soup (do not boil miso).
Add spinach or bok choy and sliced scallion. Cover and remove from heat for 1 minute to wilt. Season with salt.
Toast the bread and spread with butter and jam or preserves.
Serve the miso soup with toast and cold orange juice.