Can the liquid inside the canned chickpeas be consumed?
Should I drain it or add it to the chickpea-curry?
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Assuming you meant to ask a food safety question, otherwise this is a duplicate:
The liquid in the can with your chickpeas is food safe; otherwise, there would be no way for the beans themselves to be safe. There are two reasons you wouldn't want to eat it:
It depends on what you’re making whether you want to use it or not.
If you’re cooking something that just calls for chickpeas, you probably don’t want to use it. Especially if they tell you to rinse off the beans if you’re using canned.
But because the liquid is high in protein, it can be used as an egg white replacement. (Look up ‘aquafaba’). You just have to beware of an increased amount of salt that you may need to adjust the recipe for.
Yes, and it can be very useful, as another answer states. We use chickpea aquafaba to make meringues, and in other recipes as an egg replacer, and it works quite well. Look up recipes for a few ideas!
Here is one from a quick search: https://www.sprinklebakes.com/2020/04/chickpea-water-or-aquafaba-meringue.html
Also, if you want to avoid exposure to plastics, you can cook your own in a pressure cooker, like an Instapot, in pretty short order, and it's very economical.