There are lots of ways to make coffee taste less bitter—you can add sugar or milk. Or you can add an egg. Yes, an egg. It sounds weird, but science says it works. When you pour boiling water over an egg and coffee grounds, the protein in the egg binds to the part of the grounds that causes bitterness. Just be sure to strain the mixture—otherwise you’ll be left with scrambled egg-like clumps in your cup of joe.