Instructions: Prepare the batter first. Put the cornflour, flour, salt and pepper in a mixing bowl. Add the ketchup and vinegar and whisk to a smooth paste.

Add the baking powder. You can flavour the batter with ginger or wasabi if you wish.

Heat a pan or an electric fryer to 175-180C. Do a test with the batter and a piece of banana to check that the temperature is right.

Peel the langoustines and clean out the intestines. Split the langoustines in to and place a piece of banana down the centre. Secure together with a cocktail stick. Dip in the batter and deep fry.

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