Peel and quarter the onion. Wash and clean the radishes. Peel garlic. Set aside 5 radishes. Mash the remaining radishes, onion, garlic, beetroot and cream. Season to taste with salt, pepper and lemon juice. Wash the chervil, shake dry and chop the leaves finely
Cut the remaining radishes into small sticks. Mix the radish sticks, oil and chervil and season with some salt, pepper and lemon juice. Fill glasses with the cream. Spread the radish salad on top and serve immediately