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Put the beans, coconut milk, thyme, allspice, 4 of the spring onions and 100ml water in a pan, and bring to a simmer. Season with plenty of salt and black pepper.
Rinse the rice a few times in a sieve until the water runs clear. Tip into the pan and simmer for 10 mins over a medium heat, stirring occasionally, before lowering the heat. Put the lid on and cook for another 5 mins until the grains are tender and the liquid has been absorbed. Fluff up the rice with a fork before serving and scatter with the reserved spring onions.