Dry Pot Chicken Gan Guo Ji

Name: Dry Pot Chicken (Gan Guo Ji)
Ingredients: ½ cup dried tofu skin (see Tips), broken into pieces; 2 pounds bone-in chicken thighs, patted dry; 9 tablespoons peanut oil, divided; 2 tablespoons Shaoxing rice wine (see Tips), divided; ½ teaspoon ground pepper; 1 teaspoon cumin seeds; 1 teaspoon fennel seeds; 1 teaspoon Sichuan peppercorns (see Tips); 2 tablespoons Pixian chili bean paste (doubanjiang; see Tips); 1 tablespoon Sichuan chili flakes (see Tips) or crushed red pepper; 1 medium russet potato, peeled and sliced 1/4 inch thick; 1 bunch broccolini, cut into 1-inch pieces; 4 stalks celery, thinly sliced on the diagonal; 1 cup thinly sliced onion; 1-2 jalapeño or serrano peppers, thinly sliced; 8-10 dried small red chiles; 5 cloves garlic, thinly sliced; 1 (2 inch) piece ginger, peeled and cut into thin slivers; 4 scallions, trimmed and cut into 1/2-inch pieces; 1 tablespoon reduced-sodium soy sauce; 1 tablespoon toasted sesame seeds