Boil the live prawns in boiling salted water for 10 minutes. Drain, peel and remove the black cord. Heat
Blend the butter and flour and add in small pieces to the pan. Blend in well with a balloon whisk, cook for 3 minutes. Add the prawns and bring to the boil again. Season with salt and pepper. Remove from the heat.
Halve the pineapples, cutting them lengthways, leaving some leaves on each half. Hollow out some of the flesh and cube. Warm the pineapples and cubes in the oven or microwave. Fill the hollows with the prawn mixture, put pineapple cubes on top and sprinkle with chopped spring onion. Serve with plain boiled rice.
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