Step 1

Heat oil in a medium skillet over medium-high. Cook shallot, garlic, and chile, stirring often, until shallot is softened and translucent, about 4 minutes. Add pork and cook, stirring occasionally, until almost cooked through, about 3 minutes. Add fish sauce, soy sauce, and sugar and cook, stirring occasionally, until moisture in skillet is evaporated, about 5 minutes. Add broth, reduce heat, and simmer, uncovered, stirring occasionally, until liquid is evaporated, 12–18 minutes.

Step 2

Remove skillet from heat and mix vinegar into pork mixture; taste and season with salt if needed.