Can anyone identify this weed? It was in a bag of Sainsbury's spinach...

[LackaDAISYcal]

DH tasted it and said it tasted like washing up liquid. We decided not to eat it. DH ate the curry I had made with the spinach, before I found the interloper. Should I be getting my mourning outfit ready?

Coriander tastes soapy to some people, but that doesn't look like it.

Definitely not coriander. I thought it could be young oil seed rape? We are taking it back to Sainsbury's today as advised by customer services. We're all still alive so it's not poisonous...or if it is none of it made it into the curry I made!