450 g (1 lb) mixed wild green vegetables including nettle leaves, dandelion leaves, daisy leaves, daisy buds, white chard leaves, burnet, creeping bugle, coltsfoot leaves, shepherd's purse, sorrel and ribwort
1 handful mixed strawberry and raspberry leaves
250 ml (8 fl oz) water
salt and pepper
5 shallots
50 g (2 oz) butter
1 tablespoon flour
250 ml (8 fl oz) strong, hot vegetable stock
150 ml (1 1/2 pint) single cream
2 egg yolks