First prepare all your ingredients. Julienne the heart of palm (ubod) and jicama (singkamas) into thin strips (hiwa ng manipis). Mince the garlic (bawang), onion (sibuyas), and chop the green onions.
Heat oil in a wok over medium heat to 180°C/350°F. Sauté minced garlic and onion until fragrant (mahumot). Add ground pork and cook until it starts browning, about 2 minutes. Pour in ¼ cup water, bring to a boil, then reduce heat and simmer for 10 minutes.
Stir in the five-spice powder, julienned ubod, singkamas, and chopped green onions. Continue sautéing for 3 minutes. Season with salt and pepper to taste. Drain excess oil from the filling and let it cool completely.
While waiting, prepare the batter by combining cornstarch, water, paprika, and white pepper in a bowl. Whisk until completely smooth (walang buo-buo).
For assembly, place a lumpia wrapper diamond-style on a clean surface. Put 2 tablespoons of filling near the bottom corner. Fold the bottom corner over the filling, then fold both side corners toward the center. Roll tightly upward and seal the final edge with water.
Heat fresh oil to 350°F/175°C for frying. Dip each prepared roll in the cornstarch batter. Fry the rolls in batches for 2-3 minutes per side until they turn golden brown (kulay ginto). Remove and drain on paper towels.
For the signature sauce, combine soy sauce, brown sugar, five-spice powder, water, and corn flour in a small saucepan. Simmer over low heat for 2 minutes while stirring constantly. Slowly drizzle in the beaten egg white while continuing to stir. Remove from heat and let cool before serving.
Serve hot and crispy with the prepared sauce, ideally paired with hanging rice (puso). These can be stored unfried in the refrigerator for up to 2 days or frozen for up to a month. To reheat fried ngohiong, place in a preheated oven at 350°F/175°C for 5-7 minutes until crispy again.