3 T. fresh lime juice
2 T. grapeseed or vegetable oil
In a large bowl, whisk together lime juice, oil, and sugar until sugar dissolves.
Dice mangoes and avocados into 3/4-in. cubes; add to bowl. Add green onion, cilantro, chile, and shrimp. Mix gently. Serve or cover and chill for up to 1 hour.