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Heat the oil in a wok or pan. Fry the onion for 5 mins until softened. Stir in the red curry paste, then add the squash, coconut milk and stock. Simmer for 15-20 mins until the squash is tender. After 10 mins cooking, tip in the green beans.
Stir in the pineapple and coriander, cooking for just a few mins until the pineapple heats through. Sprinkle with the coriander leaves and serve the curry in bowls with noodles or rice.