Peel the cucumber (save the peel, see below). Halve the cucumber lengthways and scoop out the seeds using a teaspoon, then cut the flesh into 3cm pieces.
Heat the butter in a frying pan over a medium- high heat. When it has stopped foaming, toss in the cucumber pieces with a pinch of salt and fry for 5–7 minutes, until they begin to turn slightly golden around the edges.
Add the herbs and crème fraîche, if using, stir and season very well with salt and pepper. Serve immediately.
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