Steak with mushroom miso sauce

Name: Steak with mushroom miso sauce
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: Asian, French, Japanese
Ingredients: 1 tbs mirin; 1 tsp sesame oil; 3 tbs mushroom or regular soy sauce; 2 tbs sunflower oil; 4 x 200g rump steaks; 2 bunches thin asparagus, trimmed; 120g mixed mushrooms (such as shiitake and enoki); 1/2 tsp caster sugar; 1 cup (250ml) chicken stock; 1 1/2 tbs white (shiro) miso paste; 2 tbs thickened cream; 2 tbs snipped chives