How to Make It
Preheat broiler with oven rack 3 inches from heat. Stir together Sriracha, oil, orange juice, soy sauce, garlic, and chopped lemongrass in a large bowl. Add shrimp and toss to coat. Cover and chill 30 minutes. Thread 3 shrimp onto each lemongrass stalk; season evenly with salt, and place on an foil-lined rimmed baking sheet with orange slices.
Broil, flipping halfway through, until shrimp turn pink and are just cooked through, 3 to 4 minutes total. Sprinkle evenly with cilantro.