I make with ground turkey, it is a lot easier to find.
Drain water chestnuts thoroughly in a mesh colander before chopping them. Excess liquid ruins the sauce cling and makes the meat soggy. Cook ground chicken over medium heat, breaking it apart continuously with a wooden spatula until fully browned. Add aromatics like garlic and ginger only after the meat releases its initial water content. This prevents scorching the delicate sugars in the hoisin sauce.
Choose Bibb or butter lettuce heads with pliable, wide outer leaves that bend without cracking. Wash the leaves in ice-cold water to restore crisp cellular turgor. Spin them completely dry in a salad spinner or pat them firmly with lint-free kitchen towels. Trapped droplets will pool at the bottom of the wrapper and dilute the savory filling.
A wide 12-inch cast-iron skillet or heavy-bottomed stainless steel pan works best for this preparation. Large surface areas allow moisture to evaporate rapidly rather than steaming the protein. Stir in the toasted sesame oil off the heat at the very end to preserve volatile aromatic compounds. Plate the warm filling immediately alongside the chilled greens.