How to Make It
In a large skillet, heat 2 tablespoons of the oil until shimmering. Add the ginger and garlic; cook over moderate heat until fragrant, 30 seconds. Add the turkey and season with salt and pepper. Stir-fry, breaking up the meat, until nearly cooked, 4 minutes. Add the soy sauce and mirin and cook for 1 minute. Transfer to a bowl and wipe out the skillet.
Add the remaining 1 tablespoon of oil to the skillet; heat until shimmering. Add the beans and stir-fry over high heat until crisp-tender and blackened in spots, 5 minutes. Add the beans to the turkey and let cool slightly. Add the basil and toss. Transfer the stir-fry to plates and sprinkle with the peanuts.