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Heat the oil in a large, heavy-based frying pan. Cook the lamb and shallots over a high heat for 2-3 mins until golden. Add the courgettes and stir-fry for 3-4 mins until beginning to soften.
Add the spices and toss well, then add the peppers and garlic. Reduce the heat and cook over a moderate heat for 4-5 mins until they start to soften.
Pour in the stock and stir to coat. Add the tomatoes, season, then cover with a lid and simmer for 15 mins, stirring occasionally until the veg are tender. Stir through the coriander to serve.