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Fry onions until soft on low-medium heat.
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Add the garlic and cook to a pale golden colour.
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Add red fresh chillis (finely chopped), then the cumin and brown mustard seeds and then turmeric (roughly 20 seconds apart).
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Keep flame on low-medium heat. Stir continuously until spices cooked through. This is important especially for the tumeric which can otherwise make the dish taste bitter. Stir for about a good 5-10 mins. (If it becomes too dry or too hot, add a splash of water) The dish will look golden brown in colour when cooked adequately. Beware - dark brown means the spices are burnt! You don't want that.
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Tip in the chopped tomatoes tins and then an equal amount of water (2 tins of water) using the empty tomato tins.
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Now place the tomatoes, whole, in the pan.
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Cover with a lid allowing them to cook in their spicy tomato steam for 25 minutes.
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Blitz with a blender off the hob. (I use a Bamix blender).
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Put back on the hob, add 1/2 tsp of crushed red chillis and the potatoes. Cover and cook for 20 mins more. Add more water to the consistency you desire.
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Stir the yoghurt through the spicy tomato juices.
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Add 2.5 tbps of sweetener like Splenda (add bit by bit and stir and taste until you get something close to what you like).
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Cook for 5 mins more
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Optional - add a half a small handful of fresh chopped basil.
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Then serve.