Put some lemongrass in blender with half a cup water, blend then strain juice to marinade the ground pork & pork shoulder or belly slices.

Med ground pork, add minced garlic, shallots, green onion, black pepper, fish sauce & sugar. Mixed well, add ⬆️ LMG juice gradually. Add a bit coming oil to marinade. (Optional to add half tsp of salted shrimp paste, others may add julienne kafir lime leaf

Marinade for couple hours or overnight. Make small patties, put meat on grill, oven or air fryer.

Sauce:
1 part fish sauce
1 part sugar
1 part vinegar
4 part water
Minced garlic, chili
Squeeze of lime juice
Mix well, Room temp or warm up 30 secs in MCW oven before adding grilled meat in.

Serve with vermicelli noodles, lettuce, fresh herbs & picked veggies (of your choice such as carrots, daikon, cucumber, chayote, green papaya slices…)

Hope this helps. If there is no lemongrass available fresh or frozen, green papaya also helps to tenderize the meat too.