Whisk sauce ingredients together in a small bowl and set a side.
Heat a large pan over high heat. Once hot, add the oil. Once shimmering, add the shrimp and give them a quick stir to coat in oil. Sprinkle with salt and pepper, and continue to cook and stir until the shrimp are nearly cooked through, about 2 minutes.
Reduce the heat of your pan to medium, and add the sauce, white part of the green onions, and cashews. Cook for an additional 2 minutes to marry the flavors and soften the onions.
Remove from heat, serve over rice with green onions sprinkled on top, and enjoy!