For the filling, whisk together water chestnuts, chili, crab meat, cornstarch, sherry, scallions, soy sauce and lime juice.
Lay out the wan-tan wrappers on a kitchen board and form a spoonful of filling in the center of each wan-tan wrapper.
Moisten the edges of the wan-tan wrappers with a tiny bit of water and fold them in half to form triangles. Wrap the pointed ends toward the center, moisten with a tiny bit of water, and press together lightly with your fingertips to seal.
Heat the oil for deep frying to 180 °C – 190 °C until a cube of bread browns in it in 30 seconds. Fry the wan-tans in batches for 2-3 min until golden brown and crispy. Lift the wan-tans out of the oil and drain on kitchen roll.
Garnish the wan-tans with lime slices and serve hot.
Be. Make sure they are well sealed before frying to prevent the wan-tans from rising and losing the filling.