Marinate steak: In a large bowl, whisk together tamari, salt, ginger, lime juice and cold brew concentrate. Pat steak dry thoroughly and place in marinade, turning over a few times to coat. Cover and refrigerate for 30 minutes, then let stand at room temperature for 15 minutes.
Meanwhile, make dressing: In a bowl, whisk together ginger, lime juice, cold brew concentrate and maple syrup. Whisking constantly, drizzle in oil until emulsified. Taste and season with salt and pepper.
Make salad: In a large bowl, combine kale, both cabbages, carrots and radishes; toss.
Cook steak: Preheat a large cast-iron (or regular) skillet over medium-high heat. When skillet is hot, put marinated steak on the skillet. Cook for 4 minutes on each side for medium rare, flipping only once. Transfer to a cutting board and let rest for 5 minutes.
Toss salad with a few tablespoons of dressing, then divide between 2 serving plates. Garnish with almonds. Slice steak against the grain, place on top of salad and serve.