Cumin Lamb and Potato Wontons

Name: Cumin Lamb and Potato Wontons
Ingredients: 2 scallions, trimmed; 1 ¼-thick piece ginger; 8 oz. russet potato (1 medium or ½ large); ¼ cup extra-virgin olive oil; ½ small leek, white and pale green parts only, finely chopped (about ¼ cup); Kosher salt; 12 oz. ground lamb; 2 Tbsp. light soy sauce; 2 Tbsp. Shaoxing wine (Chinese rice wine); 2 tsp. sugar; 2 tsp. cornstarch; 1 tsp. ground cumin; ¼ tsp. freshly ground white pepper; 2 packages Shanghai-style wonton wrappers; ⅓ cup balsamic vinegar; 2 Tbsp. fruit jam (such as blueberry or raspberry); 1 Tbsp. unsalted butter, melted; 1 Tbsp. crushed red pepper flakes; ½ tsp. crushed red Sichuan peppercorns; 1 scallion, thinly sliced on a diagonal