Chop the fennel, celery, spring onions and courgettes into small dice, keeping them separate. Tear the leaves from the chard stalks and shred them; cut the stalks into small pieces.
Heat a medium saucepan over a medium heat and add the butter and oil. Add the fennel, celery, spring onions and chard stalks and cook gently for about 10 minutes, until soft but not coloured. Add the stock and bring to a simmer. Season with salt and pepper.
Making sure your broth is simmering well, add the courgettes. Once returned to a simmer, cook for 1 minute, then add the peas and broad beans. Simmer these for another 2 minutes. Check the peas and beans are just tender, then add the lettuce and the shredded chard leaves. Simmer for another minute.
Add the chopped herbs along with any feathery fennel fronds and, if you have them, the pea shoots, then immediately remove from the heat. Check the seasoning, then ladle into warmed bowls and serve.
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