In a large mixing bowl, add all the filling ingredients and 500 grams water. Using gloved hands, mix until evenly combined. Set aside.
In a fryer, heat oil to 365°F.
Lay netted rice paper on a clear work surface. Top with rice paper.
Place 1 prawn in the center and desired amount of filling. Roll tightly, folding sides as you roll to keep filling secure.
Brush with egg wash to seal and to prevent the roll from opening while frying.
Add to hot oil and fry for 2 minutes, or until golden brown.
Transfer to a serving plate and serve with lettuce, fresh herbs, and a ramekin of Nuoc Mam.
