For the soup with udon noodles, cut garlic cloves into thin slices, oyster mushrooms and chard into strips. Sauté garlic, mushrooms and ginger in hot sesame oil for 2-3 minutes.
Pour in soup, add sugar, soy sauce and sambal oelek and bring to a boil. Add udon noodles and chard to soup and simmer for 3-4 minutes.
Toast sesame seeds in a dry pan until lightly browned. Season the finished soup to taste, divide between two plates, sprinkle with the chive rolls and sesame seeds and serve.