20 Minute Udon Noodle Soup with Buttery Tomato Broth

Name: 20-Minute Udon Noodle Soup with Buttery Tomato Broth
Ingredients: 1 tablespoon neutral oil, such as canola or avocado; 1 tablespoon garlic paste; 1 tablespoon ginger paste; 1/4 cup unsalted tomato paste; 4 cups reduced-sodium chicken broth; 1 (3-inch) cinnamon stick; 3 whole star anise; 1 teaspoon black peppercorns; 4 tablespoons unsalted butter , cut into pieces; 2 teaspoons fish sauce; 9 ounces fresh udon noodles; 4 teaspoons toasted sesame oil; 1/4 cup thinly sliced scallions; 1 teaspoon toasted white or black sesame seeds