01 - Cut tofu into 1-inch cubes. Dissolve 1 tsp salt in 2 cups water and soak tofu cubes for 10 minutes to season. Drain well and pat completely dry with paper towels.
02 - Combine rice flour, cornstarch, white pepper, garlic powder, turmeric, and 1/2 tsp salt in a mixing bowl. Gradually whisk in 1/2 cup cold water until smooth and thin.
03 - Pour vegetable oil into a deep pan or wok to reach 340°F. Maintain temperature throughout frying.
04 - Dip each tofu cube in batter, allowing excess to drip off. Carefully lower into hot oil. Fry in batches for 5-7 minutes, turning occasionally until golden brown and crispy.
05 - Remove fried tofu with slotted spoon and drain on paper towels. Serve immediately with fresh chilies and sweet soy sauce if desired.