Heat sesame oil in a medium saucepan over medium high heat and cook garlic and ginger until fragrant.Add broth, and bring to a boil; reduce heat and simmer for 15 minutes.Meanwhile, heat peanut oil in a large skillet over medium high heat.Add mushrooms and smoked tofu and cook, stirring occasionally. Cook tofu until heated through, about 5-10 mins, and mushrooms for 10-15 mins mins or until golden brown. Season with salt and pepper.Add soy sauce and wakame to the broth mixture and set aside.In a large pot of salted boiling water, cook soba noodles, stirring occasionally, until al dente.Drain noodles and divide between 4 bowls.Meanwhile, simmer the reserved broth.Divide greens between the bowls.Divide the broth between the bowls and top with mushrooms, tofu, green onions and sprinkle with sesame seeds.