Put the wine, shallots and garlic into a heavy-based pan and bring to the boil. Cook for 2-3
minutes, until softened.
Add the leeks, potato and courgette with enough of the water to come about halfway up the
vegetables. Lay a wetted piece of greaseproof paper over the vegetables and put a lid on the pan,
then cook for 10-15 minutes, until soft. Remove the paper and add the fresh herbs and lettuce. Cook
for 1-2 minutes, or until wilted. Pour in the remaining water and the vegetable stock and simmer
for 10-12 minutes. Cool the soup slightly, then process it in a food processor or blender until
smooth. Return the soup to the rinsed-out pan and season well.
Cut the radicchio into thin wedges that hold together, then brush the cut sides with the oil.
Heat a ridged griddle or frying pan until very hot and add the radicchio wedges. Cook the radicchio
for 1 minute on each side until slightly charred. Reheat the soup over a low heat, then ladle it
into warmed shallow bowls. Serve a wedge of charred radicchio on top.