3½ Tbs. salted butter

1 onion, chopped

4½ oz potatoes, diced

3½ cups chicken stock, boiling

9 oz. cabbage leaves, chopped 

¼ to ½ cup light cream 

sea salt and freshly ground black pepper

crumbled chorizo or gremolata (optional)

In a heavy-bottom saucepan, melt the butter. When it foams, add the onions and potatoes and toss them in the butter until well coated. Sprinkle with salt and freshly ground pepper. Cover with a wax paper lid and the lid of the pan and let sweat over gentle heat until soft but not colored, about 10 minutes.  Add the boiling stock and boil until the potatoes are tender.  Add the cabbage and cook, uncovered, until the cabbage is just cooked, 4 to 5 minutes. Keep the lid off to preserve the bright green color. Do not overcook or the vegetables will lose both their fresh flavor and color. Using a blender or food processor, blend the soup until smooth. Season to taste.  Add the cream or creamy milk before serving. Serve on its own or with a sprinkling of crumbled cured Spanish chorizo or gremolata over the top, if desired.