Preheat oven to 425 degrees.
In a small skillet, cook ginger and garlic over medium heat in oil, stirring, 1 minute.
Reserve 1 tablespoon mixture and transfer remainder to a bowl.
Whisk in lime juice and zest and sugar. Season with salt and pepper.
Brush reserved ginger mixture over chicken and season with salt.
Roast on a rimmed baking sheet until skin is crisp and a thermometer inserted into thickest parts (without touching bones) reads 165 degrees, about 25 minutes.
Let cool slightly, then shred into bite-size pieces (discarding skin and bones).
Toss chicken, cabbage, and carrots with dressing. Season with salt and pepper.
Serve, topped with cilantro and cashews.
