Combine cabbage, carrots, bell peppers, onions, orange segments, and cilantro in a bowl. Drizzle rice wine vinegar, and sesame oil over the salad. Season with salt and freshly ground black pepper, to taste, and toss to combine well. Set salad aside for 15 minutes before serving.
Place tuna in 1 layer in a shallow dish or container. Stir together sake, lime juice, soy sauce, and mirin. Pour sake mixture over the fish and allow fish to marinate at room temperature for 10 minutes.
For the dipping sauce, combine all dipping sauce ingredients in a bowl and whisk to combine, set aside.
Remove fish from the marinade and pat dry. Discard marinade. Season tuna on both sides with salt and pepper. Heat peanut oil in a large skillet over medium-high heat, until hot, but not smoking. Add tuna fillets, cook, turning once, until seared but still rare inside, about 20 seconds per side, (For more well-done tuna, cook up to a minute per side, if desried). Transfer to serving plates.
Top each serving with 1/2 cup of the slaw. Drizzle a small amount of dipping sauce around each plate (or serve on the side in small bowls for dipping) and serve immediately.
Yield: 4 servings