How do you get rid of foam in soup?

Chef's answer
To reduce the foaming, peas, beans, lentils, chickpeas and rice can be soaked for a short amount of time to remove some of the excess starch before cooking.
Frequently asked Questions 🎓
By letting the cold water come to a simmer, then cooking the water away completely, you hold the bacon at a temperature that allows the fat to cook away without drying out the bacon. ... "As the water came to the boil and the fat began to dissolve, it created an unappetising white foam in the water.
Chorizo has a very high fat content, which leads to the soft and mushy appearance and feel before and after cooking. As long as it is a bright red when taken out of the package/casing and then a duller red or even a light brown after cooking, it is still good, and it is still safe to eat..
At very hot temperatures, the starch reacts with the water molecules, causing an increase in surface tension, which ultimately forms small bubbles or pockets of air surrounded by the starch, creating foam.
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