It’s mango season here again, in Egypt. They’re everywhere and so the prices are quite reasonable (15 LE, about £0.63 a kilo). We’re down to our last few tablespoons of mango chutney and as it forms a crucial part of the Prawn Pathia that my life loves so much, I thought I’d better get making a new batch of it.
I have her favourite recipe (I will be trying some new ones this season as well), so I peeled and diced the mangos, put the spice mix together, and popped over to Ahmed’s for some more white vinegar.
As I was mixing the mango chunks with the vinegar, my eye caught my sous vide machine, still set up from my breakfast eggs. Hmmm. How good would the mango be if it was sealed away and slow cooked for, say, 8 hours?
I fried off the spice mix and added it to the mango and vinegar, then poured it all into a ziploc bag, removing as much of the air as possible.
Sous vide preheated to 83°C, bag clipped to the side of the pot and off I went to do other things.
In the evening I placed the bag into a pot with cold running water running through it from the tap for 5 minutes.

Time for a taste and texture test – oh dear. The taste was fantastic, the sous vide really helping to retain the juices and flavour of the mango but, without the evaporation, the chutney had not reduced at all. I decided to look at it in the morning and put the bag to one side to settle overnight.
As dawn’s rays filtered through the kitchen window (yeah, right!), the sauce had not noticeably thickened. I was fretting about potentially ruining the taste and fragrance of the sauce by reducing it over heat, when I realised … another of my birthday presents was the molecuar gastronomy kit! It contains a plethora of powders and potions that, amongst other things, thicken mixtures!
Now the big decision… which method to use?
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Gelatine – hmm, it’s beef gelatine, the good lady would not really be happy with that.
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Agar Agar – possible, but a bit of a brittle gel and I didn’t want solid chutney.
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Xanthan Gum – all round thickener and friend of chefs – I’d found my saviour!

I poured the chutney into a large bowl and carefully measured out 2g of gum, sprinkling it over the chutney and then blending it in with the Bamix. Promising, but still a little runny. 1g more of the powder blended in produced a perfectly smooth and silky chutney. I used 3g of Xanthan as the recommended amount for thickening is between 0.1% and 1% of the total weight, and the chutney was pretty much spot on 800g. As the chutney wasn’t utter water, I worked my way up from 2g (0.25%) and settled on 3g (0.33%) which produced the viscosity I was looking for.
It remains to be seen whether we’ll discover an even more delicious mango chutney than this one (most likely we will), but at least there’s 500ml of it available now.
Mango Chutney
Ingredients
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Spice Mix
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1 tablespoon cooking oil
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2 teaspoons fresh ginger, finely minced
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2 cloves garlic, finely minced
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1 red chili, sliced
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2 teaspoons whole nigella seeds
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1 teaspoon ground coriander
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½ teaspoon ground cumin
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¼ teaspoon turmeric
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¼ teaspoon ground cardamom
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¼ teaspoon ground cloves
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¼ teaspoon ground cinnamon
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Mangoes
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500g mango flesh, (about 1kg unpeeled mangoes), peeled and diced
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160g white granulated sugar
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240ml white vinegar
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¼ teaspoon salt
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Finishing

Method
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Pre-heat the sous vide to 83°C.
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In large bowl, combine the diced mangoes, sugar, salt, and vinegar and stir well.
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Heat the oil over a medium heat in a pan.
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Saute the ginger, garlic and red chilies for a minute.
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Add all the spices and saute for another minute. .
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Allow the spices to cool slightly and add to the mango mixture., stirring well.
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Place the mixture in a ziploc bag, squeezing out as much air as possible, and place in the sous vide bath for 6-8 hours.
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Remove bag from bath and cool in an ice bath or under running water.
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Empty the bag into a large bowl and sprinkle the xanthan gum over, then blend with a hand blender until it thickens.
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Pour into a sterilised jar and refrigerate.
For storage:
- Chutney will keep for a while because of the high acidity content.
- A conservative time frame would be up to 2 months in the fridge (in a sealed jar) or for several months in the freezer.