Steam the green beans until just tender-crisp, about 5-8 minutes. Immediately run them under cold water or plunge into an ice bath to stop the cooking process and preserve their bright green color.
Pat dry and set aside.
In a small bowl, prepare the dressing by combining the tahini, garlic, toasted sesame oil, mirin, tamari, and lemon juice.
Whisk until smooth and creamy. If it's too thick, add a teaspoon of water at a time to reach a drizzling consistency.
In a large bowl, combine the cooked green beans, minced scallions, and fresh parsley.
Pour about half of the tahini dressing over the vegetables and toss gently to coat everything evenly.
To serve, create a bed of salad greens on a large platter.
Arrange the dressed green beans and the tofu strips in a circular pattern on top of the greens. Mound the halved tomatoes in the center.
Drizzle the remaining tahini dressing over the entire salad and finish with a generous sprinkle of toasted sesame seeds or gomasio before serving.