Spicy Noodle and Pork Soup

Name: Spicy Noodle and Pork Soup
Ingredients: 1 pork tenderloin, cut in half lengthwise and sliced thinly; 1/2 tsp (2.5 ml) sambal oelek, or less, to taste; 2 tsp (10 ml) toasted sesame oil; 2 tbsp (30 ml) olive oil; 6 green onions, thinly sliced; 1 garlic clove, finely chopped; 5 cups (1.25 litres) chicken broth; 2 cups (300 g) sweet potato, peeled and diced (about 1 potato); 4 slices fresh ginger, peeled; 1 star anise; 1 package 200 g cooked udon noodles (see note); 1/4 cup (10 g) fresh cilantro leaves