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Heat the oven to 180C/160C fan/gas 4. Cut the squash in half lengthways and scoop out the seeds. Get a flameproof roasting tin ready that will fit the squash snugly (ours measured 22 x 18cm). Oil the squash and season with salt, then place cut-side down in the tin with an unpeeled garlic clove or 2 in the cavity of each half. Roast for 1 hr.
Once tender, carefully lift the squash halves and garlic onto a board. Melt the butter in the tin over a low heat, add the onions and cook gently for 10 mins until soft and caramelised. Splash in the vinegar and scrape any sticky bits from the base of the dish. Squeeze the cooked garlic from the skins and stir into the onions with the allspice and rice. Season well and pour over 350ml hot water. Bring to a gentle simmer, then remove from the heat, carefully wrap the tin in foil and cook in the oven for 25 mins with the squash placed cut-side up directly on the oven rack alongside.
Fluff up the rice with a fork and check it is cooked. If not and the tin is dry, add a splash more water, re-wrap in the foil and return to the oven for 5-10 mins. Scoop some of the soft squash out of the skins, leaving a layer of about 1cm in the skin. Mix the scooped-out squash into the rice, breaking it into smaller chunks as you mix. Add the pomegranate and feta and pack the rice mixture back into the squash halves, then put back in the tin, leaving any extra rice around the squash. Return to the oven for 10 mins.
Mix the ingredients for the salsa together in a bowl. When the squash is ready, spoon the salsa over the top, then cut into wedges to serve.
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