Clean the carrots and cut into fine cubes or wedges. Peel the onions and finely dice them.
Melt the butter in a saucepan and sauté the onions until translucent, add a little salt. Then put the carrots on top and fill up with vegetable stock. Add a pinch of lovage (if you like). Do not steam for more than 10 minutes. Remove from the hotplate and sprinkle with arrowroot (dose carefully - thickens quickly). Sprinkle plenty of parsley.