Add the ground pork, lemongrass, garlic, fish sauce, red curry paste, lime zest, brown sugar, and black pepper to a large bowl. Mix gently until the seasonings are evenly distributed, taking care not to overwork the meat.
Using slightly damp hands or a small cookie scoop, form the mixture into meatballs approximately 1 1/2 inches in diameter. You should have about 20 to 24 meatballs.
Heat the neutral oil in a large skillet over medium-high heat.
Add the meatballs in a single layer, working in batches if necessary. Brown them for about 5 to 6 minutes, turning occasionally, until golden on several sides. They do not need to be completely cooked through at this point.
Transfer the browned meatballs to a plate and reduce the heat to medium.
Add the red curry paste for the sauce to the same skillet and cook for about 30 seconds, stirring, until fragrant.
Pour in the coconut milk and stir well, scraping up any browned bits from the bottom of the skillet.
Add the fish sauce and brown sugar, then bring the sauce to a gentle simmer.
Return the meatballs and any accumulated juices to the skillet. Cover partially and simmer gently for about 8 to 10 minutes, turning the meatballs once or twice, until they are cooked through and the sauce has thickened slightly.
If the sauce becomes thicker than you like, add a splash of water or chicken broth.
Remove the skillet from the heat and stir in the lime juice.
Taste the sauce and adjust with additional lime juice, fish sauce, or salt only if needed.
Garnish with fresh cilantro, green onions, sliced chile, and lime wedges. Serve immediately with jasmine rice or noodles.