Giant Chewy Potato Noodles

Name: Giant Chewy Potato Noodles
Ingredients: 2 1/2 pounds (about 4 medium) Yukon gold potatoes, peeled and cut into 1-inch chunks (see Cook’s Note); 3 cups potato starch; Kosher salt; 1/2 cup neutral oil, such vegetable or canola oil; 6 cloves garlic, minced; 2 scallions, minced; 1 tablespoon crushed red pepper flakes (see Cook’s Note); 4 teaspoons gochugaru (Korean chili flakes); 2 teaspoons toasted sesame seeds; 2 tablespoons light soy sauce; 1 tablespoon dark soy sauce; 4 teaspoons Chinkiang vinegar or other black vinegar; 1 tablespoon Chinese sesame paste or tahini (see Cook’s Note); 1 teaspoon sugar; 1/2 teaspoon chicken bouillon powder; Cilantro leaves, for garnish