- Mix the mayonnaise, sweet chili, and Sriracha sauce with a whisk. 
- Set sauce aside for flavors to infuse. 
- Taste after 10 minute and then add more Sriracha sauce to increase spiciness. 
- Dry shrimps with paper towel so the batter can stick better. 
- Mix the flour, starch, salt, and baking powder. 
- Bring a skillet of oil to heat. 
- Pour the soda water into the flour mixture and whisk away. If the batter is too thin you can add flour one tablespoon at a time until you get desired consistency. It will remain transparent when you dip the shrimp, you want it to be light and crunchy. 
- Dip the shrimp into the batter, and then immediately move it to the oil. 
- Fry both sides until golden then drain in a colander to get rid of the excess oil. 
- Toss the fried shrimp into the sauce one batch at a time to ensure even distribution of the sauce. 
- Garnish with spring onions and serve.