Prepare Nuoc Cham Sauce: In a small bowl, combine fish sauce, lime juice, rice wine vinegar, and white sugar. Stir until dissolved, add water and minced garlic, and let sit for 10 minutes.

Soak Vermicelli Noodles: Boil water, remove from heat, add noodles, and soak for 5-7 minutes. Drain and rinse.

Make Pork Meatball Mixture: In a mixing bowl, combine pork mince, fish sauce, white sugar, green onions, minced garlic, white pepper, salt, and lemongrass. Blend and form into meatballs.

Cook the Meatballs: Heat oil in a skillet, add meatballs, and cook for 2-3 minutes on each side until golden brown and cooked through.

Assemble Your Bun Cha: On plates, place vermicelli noodles, top with meatballs, add fresh vegetables, and drizzle with Nuoc Cham sauce.