What to do with fermented lentils?

3 days ago, I decided to do some brown lentils, so I did a lentil soup with zucchinis and spice (a lot of cumin and cayenne). I didn’t have tupperware so I left it in the pot with the lid.

And this morning, I found out they are fermenting. then is some bubbles and a strong fermenting smell, still a “clean” smell.

I’m not sure what to do, part of me want to throw it away but I don’t want to waste it either. Can I save it or maybe use it for something else?

thanks