Prepare the noodles in a separate pot according to package directions. Be careful not to overcook.
Preheat a wok or very wide pot over low heat and use 2 tablespoons of oil to toast the garlic until nice and golden. Be very careful not to burn, it should only take 2 minutes or so. Have a plate ready, and use a thin, slotted spatula to transfer the toasted garlic to a plate, leaving as much oil in the pan as you can.
Now turn the heat up, drizzle in a tablespoon or so of oil and saute the tofu cubes until golden brown, about 5 minutes.
Cut reserved porcinis into bite sized pieces. Add to wok and aute an additional 5 to 7 minutes, drizzling in extra oil if needed. Add in green scallions and the white part of the bok choy. Saute 2 minutes. Add mirin and stir for another minute.
Measure broth and make sure it comes to 8 cups. Add to the wok and heat through. If you need to add a little water that’s fine. Bring to a boil. Add the green part of the bok choy to wilt. Add 2 to 3 tablespoons of tamari and taste for salt.