1 Peel and chop the onion. Wash and finely chop the leek. Peel, wash and finely dice the potato.
2 In an oiled saucepan, sauté the onion and leek for 5 minutes over low heat. Add the potatoes and pour in the milk. Dilute in the stock cube. Cover halfway and simmer for 20 minutes. Mix
3 Open and remove the pits from the avocados, remove the flesh. Mix it with the cream and the juice of half a lemon. Season with salt and pepper. Incorporate this preparation into the soup, mix again and reheat, without boiling.
4 Divide the velouté among pretty plates or verrines and place salmon roe on top. Serve immediately.