I've often seen this pepper come up in forums online as one with really great flavour.
Seeds and info from Jim Duffy's site Refining Fire Chiles.
Big Mustard Mama-(Capsicum chinense)-The Big Mustard Mama is a superhot strain that is a variant of the Big Black Mama created by Troy Primeaux of Louisiana Lafayette University. Troy is the creator of the 7 Pot Primo and is a Horticulturist Major. This is a mustard olive green very bumpy nuclear hot pepper. It’s stability is unknown as many have not grown it out yet. We obtained our seeds from one of Troy’s close friends with his permission to grow and sell in 2014. The Big Mustard Mama is very productive and makes peppers over 2 inches in diameter and almost 3 inches long. It is known for making some Monster size specimens! The Big Mustard Mama chile plants grow up to 4 feet tall.
Seed from and info + photos used with permission of Jim Duffy at Refining Fire Chiles