I saw this recipe in the American food magazine Saveur and I have used it several times since. It’s important to use seawater prawns, as opposed to freshwater, as the taste is far superior.
Put the prawns and white fish in a food processor and blend to a coarse purée. Put this and all of the remaining ingredients except the breadcrumbs into a bowl, mix well and season with salt and pepper. Make a tiny burger shape with a little of the mix, dredge with some breadcrumbs and fry in a little oil to test the seasoning of the mix. Add more seasoning if necessary.