Wash lime tree leaves and set aside
Cut lemongrass stalks into 2-3-inch pieces
Rinse pork intestines and pig's ears under cold water, then set aside
Fill half a large pot with water and set to boil over medium heat
Add pork intestines, pig's ears, lime tree leaves, lemongrass, and salt to the pot with water before it boils. Allow everything to boil for 10 minutes
Discard the hot water along with the lime tree leaves and lemongrass, keeping the intestines and ears in the pot
Rinse the intestines and ears well under cold water
Heat 1/4 cup of water in a medium-sized pot over medium-high heat, then add palm sugar to the pot and stir
Continue to stir the palm sugar pods vigorously with a spoon or spatula until the pods break up and the sugar begins to melt
Add anise star and cinnamon sticks to the pot and continue to stir everything together
Add soy sauce and stir
Add fish sauce and stir
Add MSG and stir
Add pork intestines and pig's ears and stir everything together, so that the sauce coats the intestines and ears evenly
Braise the intestines and ears over medium-low heat, stirring continuously, for 30 minutes
Remove the pork intestines and pig's ears from the pot and chop into small, 1-inch bits
Serve with steamed rice, fresh vegetables, and spicy Cambodian dipping sauce .