Cook the broad beans in a saucepan of boiling, salted water for 1 min, then drain and rinse the beans in ice-cold water to stop them cooking further. Pop the beans out of their jackets and put them in a mixing bowl. Smaller beans can be left in their jackets, but the skins of large beans are a bit chewy and best removed.
Take the broad bean tips and separate the smallest leaves closest to the flower buds from the top of the growing tip. Add both to the mixing bowl. Tear the fennel fronds up, finely chop the spring onions and add these to the bowl too.
For the dressing, roughly chop the sorrel leaves, removing any thick stems, and put them in a blender or food processor with the olive oil, vinegar and a pinch of salt. Whizz to make a green sauce. Check the balance of flavours and adjust the seasoning accordingly. Pour half of the dressing over the beans and toss together gently.
Spread a thick layer of goat’s cheese over two serving plates. Pile the broad bean mixture on top, drizzle over the remaining sorrel dressing and serve.