1. Heat olive oil in a medium saucepan over medium heat. Add garlic, scallion whites, lemongrass, and piece of ginger. Cook, stirring, until translucent, about 1 minute. Add coconut milk, green curry, sugar, fish sauce, and kaffir lime leaves; let mixture simmer for 30 minutes. Strain mixture through a fine mesh sieve set over a medium bowl; stir in lime juice and scallion greens set aside.

2. Preheat oven to 425 degrees. In a medium ovenproof skillet, heat grapeseed oil over medium-high heat. Season snapper with salt and pepper and add to skillet. Immediately transfer skillet to oven and cook until opaque, about 7 minutes. Remove from oven and keep warm.

3. In a medium skillet, add olive oil and minced ginger. Cook over medium heat, until ginger just begins to brown, about 1 minute. Add bok choy and cook until soft, 2 to 3 minutes. Season with salt and pepper; sprinkle over cashews and toss to combine.

4. To serve, spoon some of the sauce onto each of 4 plates. Top with bok choy and snapper; serve immediately.