Dumpling Soup With Bacon and Snow Peas

INGREDIENTS

• 1 pound frozen Asian-style dumplings or pot stickers
• 2 tablespoons sesame oil
• 1 teaspoon sugar
• Kosher salt
• 4 ounces snow peas, trimmed and cut into 1-inch pieces
• 2 tablespoons cornstarch
• 4 cups low-sodium chicken broth
• Freshly ground pepper
• 2 plum tomatoes, cut into 1-inch pieces
• 2 tablespoons minced peeled ginger
• 1 bunch scallions, chopped
• 4 slices thick-cut bacon, cut into 1/2-inch pieces
• 1 bunch watercress, tough stems trimmed, cut into 2-inch pieces