Green beans with leeks

1 leek
dried marjoram
3 spring onions
500 g green beans
1 teaspoon white miso

Sweat the leek for a minute in a dutch oven. Then add a big splash of water and a big pinch of marjoram, cover the pan and lower heat. Let it simmer until the leek is completely soft. Uncover and stir in the green onion and blend in the miso paste. Let the water mostly cook off, raising the heat if necessary. Remove from heat when you have a nice goop. Cook green beans separately, either by steaming or blanching. To serve, toss the beans with the leeks and reheat if necessary.