Spicy and Sour Sichuan-Style Stir-Fried Potatoes

Name: Spicy and Sour Sichuan-Style Stir-Fried Potatoes
Cuisine: Asian, Chinese
Ingredients: 1¼ lb. large potatoes (any kind), peeled; 2 Tbsp. vegetable oil; 4 small dried chiles (such as er jing tiao or chile de árbol), torn, seeds removed if desired, or 1 tsp. crushed red pepper flakes; 1 tsp. Sichuan peppercorns; 4 garlic cloves, coarsely chopped; 2 scallions, thinly sliced; 1 Tbsp. plus 1 tsp. black (Chinkiang) vinegar; 1¼ tsp. Diamond Crystal or ¾ tsp. Morton kosher salt; Small handful of cilantro leaves with tender stems; Steamed white rice (for serving)