Combine garlic, tapioca flour, fish sauce, soy sauce, sugar, and white pepper in a bowl; add prawns and toss to coat.
Heat 2 tablespoons oil in a heavy skillet over high heat. Add 1/2 of the prawns in single layer; fry until golden brown and crispy, 1 to 2 minutes per side. Repeat with remaining oil and remaining prawns.
Use wok instead of skillet, if desired.
Prawns can be fried in 3 batches or more, if needed, depending on the size of your skillet or wok.
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