Why does rinsing lentils create foam? Is this natural?
I ran out of organic brown rice today, and I happened to have some lentils, but when I went to rinse them with the spray nozzle on my sink (set to warm) they started to create a bubbly foam. The lentils were in a bowl not a strainer. I'm not used to this, so I'm wondering if it's natural. But I'm also recalling how when I made homemade potato chips and when I rinsed thin slices of potatoes I got a similar foaminess.
What's causing this foam? Is it natural with lentils?
Best Answer
Yes, it's perfectly natural. Dust being rinsed off the outer surface of the lentils makes the water more viscous and helps to trap air in the form of small bubbles. In a strainer, the dust would be rinsed away, so you don't see the same effect; a spray nozzle especially adds a lot of turbulence, which causes more air to get trapped. You can get similar results when rinsing many processed, dried grains or pulses.
The effect from potatoes is similar, but it's caused by proteins in the potato being rinsed out into the soaking water. Neither has anything to do with the presence of arsenic, so don't worry.
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Is it normal for lentils to foam?
The foam on top of a pan of lentils or beans is created by 'saponins' within the beans, which form a lather in water. The foam is not dangerous, and it's totally safe to consume. You can skim it off the top of your lentils if you like, but it's totally fine to leave it too.Why should lentils not be soaked?
Because lentils are small with tender skins, they cook quickly without soaking. Lentils also lack sulfur, so you do not need to soak them before cooking to eliminate gas.Do you drain the liquid from lentils?
Remember, no soaking is required for cooking lentils and to keep an eye out for any debris to remove from your lentils. Add lentils to a colander ($12, Crate & Barrel) or sieve, and rinse with cool running water; drain.Easy Natural Surfactant formula
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Answer 2
I've been given a jar of water from drained cooked lentils. Shake it vigorously and it will produce foam. Whisk it and I'm told it will turn stiff like the consistency of whipped cream!
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