Thai Mango-Prawn Salad

Heat oil in a wok over medium-high to high heat. Add shrimp; cook until starting to turn pink, about 2 minutes. Add garlic and ginger. Cook for 1 minute. Stir in mirin, fish sauce, vinegar, and red pepper flakes. Add red onion, carrots, cashews, and green onions. Stir-fry for 1 to 2 minutes. Add mango, lime juice, soy sauce, and sugar. Remove salad from heat.

Place romaine hearts on a platter and spoon salad on top including sauce. Serve immediately.