All ingredients ready? Let's begin!
In a medium mixing bowl, whisk together the mayonnaise, chili sauce, sriracha, tahini, salt, and pepper until well combined.
Transfer the sauce to a jar with a lid and store in the refrigerator until ready to serve.
In a deep pot, cast-iron skillet, or deep fryer, over medium-high heat warm about 2 inches deep of vegetable or seed oil. You want it to be around 340°F.
While the oil is heating up, make the batter. In a large mixing bowl, whisk together the flour, cornstarch, baking powder, and salt. Whisk in the club soda until you have a smooth batter.
Holding the shrimp by the tails, dip them in the batter – only enough to fit in a single layer in the pot with some space between each.
Fry the shrimp for 3 to 4 minutes, turning over at 2 minutes, until the batter is golden brown and crisp. You will have to do this in batches so as not to crowd the pot.
Remove the cooked shrimp to a paper towel-lined platter to drain.
Serve the shrimp while warm and crunchy with boom boom sauce on the side.