Step 1

In a deep fryer or Dutch oven fitted with a candy thermometer, heat oil to 350°F. Line a plate with several layers of paper towels and set next to the fryer.

Step 2

In a large bowl, combine mayonnaise, chili sauce, Sriracha, and 1/2 tsp. salt. Set aside.

Step 3

In a medium-sized bowl, pour buttermilk over shrimp. Toss to coat. In a shallow bowl, use a fork to combine cornstarch, flour, and remaining 1 tsp. salt. Working with 5 to 7 shrimp at a time, lift shrimp out of buttermilk, allowing the excess to drip off, and transfer the shrimp to the cornstarch-and-flour mixture. Turn the shrimp in the flour to coat. Use a slotted spoon to gently lower shrimp into hot oil. Fry for 5 minutes, flipping the shrimp once halfway through cooking. Remove shrimp to paper towel-lined plate. Repeat with remaining shrimp.

Step 4

Once fried shrimp have cooled slightly, gently toss them in the prepared sauce. Lift them out of the sauce, allowing the excess to fall off, and transfer to a serving platter. Garnish with fresh chives and serve immediately.