1. Steam the green beans just until tender (4-5 minutes). Rinse under cold water immediately and set aside.
2. In a small bowl, combine the peanut butter, tamari, sesame oil, and water. Set aside.
3. Heat the peanut oil in a large skillet over medium-high heat. Add the garlic, ginger, and red pepper flakes and cook until fragrant (30 seconds).
4. Add the beans to the skillet and cook until lightly browned (2-3 minutes). Add peanut butter mixture and toss to coat.