Step 1: In a bowl, add salt, garlic powder and white pepper to flour . Pour in water and mix in beaten egg until batter is slightly lumpy.
Step 2: Batter shrimp (seafood) and fry until lightly golden brown. Set aside for the sweet and sour.
Step 3: Heat oil in a wok and fry the garlic until golen color.
Step 4: Add cucumber, onion and stir until nearly cooked, then add tomatoes. Stir until all cooked.
Step 5: Add the shrimp (or pork), white vinegar, fish sauce and sugar (add more vinegar, sugar and fish sauce according to your desired taste - the original taste should be a nice balance between sour, salty and sweet taste.)
Step 6: When it starts to boil, thicken with the diluted corn starch.
Step 7: Served with hot steamed rice.