Method:
Preheat oven to 350°F. Spread coconut flakes on a rimmed baking sheet and bake until lightly browned and fragrant, stirring occasionally, 10 to 12 minutes. Transfer coconut from the baking sheet to a plate and let cool.
Heat a wok or large sauté pan over high heat. When hot, add a teaspoon of oil. Swirl to coat pan with oil. Add ginger and stir-fry until fragrant, about 1 minute. Add pineapple and a pinch of salt. Stir constantly, spreading the pineapple over the surface of the pan, for about 2 minutes. Transfer pineapple to a large bowl and set aside. Add the remaining oil to the pan, then add mango and a pinch of salt. Cook, stirring often, for about 2 minutes. Transfer mango to bowl with pineapple. Add butter and toss gently until melted.
To finish, scoop ice cream into bowls. Add a few tablespoons of stir-fried fruit and toasted coconut to each serving. Serve immediately.