Finely chop the spring onion and garlic. Chop the mushrooms and beans too.
Heat the oil in frying pan and gently sauté the garlic, mushroom and spring onion under a lid for about 5 minutes.
Add the vinegar and soy sauce and let it sizzle for a minute, then add a drop of water and the beans. Put the lid back on and cook for 3 minutes over medium heat or until the beans are tender.
Stir in the lentils and the rice, then warm through for a couple of minutes over low heat.
Season to taste and stir in the chopped herbs and sesame oil.
Serve warm.