Mix all the ingredients together, except the wrappers. Separate the wrappers.
Place one tbsp. of tuna filling at at the center of the wrapper. Take the side of the wrapper nearest you and roll toward the middle. When half-rolled, take the sides and fold them inward, then finish rolling away from you. Brush the edges with a little egg wash to seal completely. Repeat until all the wrappers are filled.
Heat wok or skillet. Pour in the cooking oil. When the oil starts to smoke, carefully lower the egg rolls one by one. Do not overcrowd the skillet. Cook only 4 to 5 pieces of rolls at a time. Roll them in oil to brown evenly. Remove once they turn golden brown. Drain on paper towels.
Serve at once, accompanied by sweet-sour sauce.
For the sweet-sour sauce :
In a small saucepan, mix together all ingredients for the sweet-sour sauce. Set over medium-high heat until thick and the cloudiness has disappeared. In another saucepan, heat 1 tsp. of oil. Add carrots. Stir for a minute. Add bell pepper, onion, tomato, ginger and garlic. Stir for 15 seconds. Pour in the sweet-sour and bring to a boil. Remove from heat. Add a few drops of sesame seed oil. Pour over fried fish. Serve at once