Put half the butter in a heavy-based frying pan that will fit all the radishes snugly. Heat the butter until its just foaming and starting to turn a nut-brown, then add the radishes and turn to coat in the butter.

Fry the radishes, turning them every few mins and adding small knobs of the remaining butter as they cook, for 10 mins until theyre glazed and have softened and wrinkled. Turn the heat up to maximum, add the lemon juice, let it sizzle for 1 min, then remove the pan from the heat. Season with sea salt and serve.