Heat your preferred frying oil in a pan or Dutch oven to 350°F (175°C). If you have one, I recommend using a frying thermometer to get the oil to an accurate temperature.
In a bowl, whisk together all-purpose flour, rice flour, baking powder, white pepper, garlic powder, sugar, coriander, salt, minced garlic, sliced bird’s eye chilies, scallions, and water. Mix until a smooth batter forms.
Dip each tempeh fillet into the batter, ensuring an even coating.
Fry the coated tempeh until it achieves a golden brown, and crispy texture. Use a slotted spoon or tongs to remove and drain excess oil.
In a separate bowl, prepare the chili sauce by mixing the kecap manis, sliced bird’s eye chilies, minced garlic, rice vinegar, and minced chives.
Arrange the fried tempeh on a plate over lettuce leaves, drizzle with the chili sauce, and garnish with optional toppings like thinly sliced bird’s eye chilies, cilantro leaves, and scallions.