Foam (again)

The first post I made about foam* was supposed to include some of these photographs. Instead, I kept it about soap foam.
This time, the foam has to do with the protein content of the photo subjects (Links about food foams: 1, 2, 3)

This foam formed on top of boiling beans (hence the dark bits)

You guessed: beaten egg whites

Coffee in hot water

This foam formed during the first days of beetroot fermentation

I took the photos with my Redmi Note 8 and edited them with Snapseed.