Add the dried chilis to a mortar and pestle. Coarsely pound them together to break them up. Set aside. This recipe uses 2 medium-dried chilies, which gives a medium spice level but feel free to adjust the quantity to your liking. Alternatively, use dried chili flakes or chili powder.
Finely dice the shallots and set them aside. Add the water to the pan set over medium-high heat and bring to a simmer. Add the ground chicken and 2 tsp of fish sauce to season the meat. Use a wooden spoon to stir constantly, breaking up any large clumps, and cook until almost done. Turn the heat down to medium-low.
Finely dice the cilantro, scallions, and fresh mint and set them aside. Add the shallots and chili flakes to the chicken. Cook for a couple of minutes until the shallots have softened slightly.
Add the remaining 1 tablespoon of fish sauce, lime juice, chopped cilantro, scallions, and fresh mint. Stir through. Adjust seasoning if needed.
Transfer to a serving dish. Serve with lettuce wraps and a fresh squeeze of lime juice.