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1
Cook sweet potato in a medium saucepan of boiling water for 5 mins or until tender. Drain well. Mash sweet potato; measure 1 cup. Cool.
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2
Bring 2 cups water to a boil in a small saucepan. Stir in quinoa. Reduce heat to low; cover and simmer for 15 mins or until tender. Drain well. Cool.
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3
Heat 1 tbsp of the oil in a medium skillet on medium heat. Cook onion, stirring, for 8 mins or until soft. Add garlic, ginger, chili pepper and curry powder; cook, stirring, on low heat for 3 mins or until soft and fragrant.
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4
Combine mashed sweet potato, quinoa, onion mixture, cilantro, egg and flour in a large bowl. Season. Form level 1/2 cups of mixture into eight 3-inch patties. Place on a parchment paper-lined tray. Cover; refrigerate for 30 mins or until chilled.
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5
Heat 2 tbsp of the oil in a large skillet on medium heat. Cook 1/2 the patties for 3 mins each side or until golden and heated through. Drain on paper towels. Repeat with 2 tbsp of the remaining oil and patties.
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6
Heat remaining 1 tbsp oil in same skillet on medium heat. Cook tomatoes, mustard seeds and curry leaves, stirring occasionally, for 5 mins or until tomato is softened. Season to taste.
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7
Serve quinoa cakes with tomatoes, yogurt and salad leaves.