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1
Preheat the oven to 200C/gas mark 6.
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2
Steam or boil the sweet potatoes for 10-15 minutes until completely tender.
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3
Place 2 tablespoons of water in a medium-sized saucepan with the oil, garlic, celery and onion and cook for 3 minutes.
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4
Add the squash and cook for a further 2 minutes, stirring frequently.
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5
Add the stock and bring to the boil.
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6
Cover, lower the heat and simmer for 10 minutes.
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7
Add the beans, peas, peppers, courgettes and tomatoes and simmer for a further 5 minutes.
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8
Mix the arrowroot with a little water and add along with the parsley.
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9
Drain the sweet potato and mash.
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10
Transfer the filling to a pie dish and top with the sweet potato mash.
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11
Bake for 12-15 minutes until the sweet potato begins to brown.
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12
Serve immediately with a green salad.