What is the black thing inside a mussel?
Similarly one may ask, can you eat the beard of a mussel?
The beard isn't harmful or inedible (just not particularly desirable to our taste buds), so don't fret if there are a few little threads left that you can't grasp. With a bit of practice, cleaning and debearding a few pounds of mussels should only take about 15 minutes of your prep time.
Also Know, can you eat the whole mussel?
Eating Mussels Casually. Eat straight from the shell. Anywhere besides a formal dinner, it is acceptable to pick up the shell and fill it with a little bit of the broth and then suck the mussel and broth directly from the shell, although you may still want to loosen it with a fork first.
A freshwater mussel has a tooth on the inside of each shell or valve. When the valves are together the teeth lock together like a puzzle piece. This keeps the two shells from slipping around and hurting the freshwater mussel inside. The umbo is where the two valves (or shells) are held together.