Wearing rubber gloves, sort through the nettles, discarding anything you don’t like the look of and any thick stalks. Wash the nettles and drain in a colander.
Melt the butter in a large saucepan, add the onion and cook gently for 5-7 minutes until softened.
Add the stock, nettles, potato and carrot. Bring to a simmer and cook gently until the potato is soft, about 15 minutes.
Remove from the heat. Using an electric hand-held stick blender, purée the soup and then season with salt and pepper to taste.
Ladle into warmed bowls and float a teaspoonful of creme fraiche on top. As this melts, swirl in a few drops of extra-virgin olive oil and Tabasco.
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