I've never tried the box version of Coco but I've been to the restaurants many times. It's it's certainly the most popular and populous curry chain. I prefer GoGo but it's good.
Golden Curry is dogshit. You want to find one of these two brands:
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Kokumaru. Blue is best.
or my personal favourite.
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Torokeru. Again, Blue is best.
When cooking the curry, you don't want to overload the water with the roux. Method as follows:
Chop up your protein (I prefer chicken breasts, broken down into chunks, but anything will work). 500g or so. Start cooking it on a medium heat, you just want to brown all the sides at this point. While you are doing this...
Cube 2 carrots and 4 potatoes roughly to the same side as the meat. Inch to an inch long sides. Halve two onions. Add some Japanese Negi if you can find it, cut into 2 inch long cylinders. Throw therse into a fry pan or pot, drizzle with a little olive oil, and cook them until they start to colour a little. Once this is done, combine everything into a big pot, add water until everything is covered by with about an inch of water on top. Then can add any extra flavour (I like Ichimi) and Wostershire sauce, and boil it until a knife goes into the potato easily. Should take about half an hour.
After that, reduce the heat to half, add water again to make sure the vegetables and meat are covered by an inch again, and add the curry blocks. You should only need 4 - make sure you seperate the invidual cubes, drop them on top of the curry in the water spread out, and leave them for at least 10 minutes while they slowly dissolve in the warm water.
After they have been in there and mostly dissolved, Stir it to make sure all the roux dissolves fully. Don't be too rough or you will break up the potatoes. After you do this, bring to the boil again, and it's ready to eat, but leaving it longer will increase the flavour and it will be at its most delicious the next day as leftovers you've kept in the fridge.
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