Everything about mustards . What's the best, the worst and the most popular mustard in the world? Discover national, regional and local mustard varieties around the world. Mustard explores curious and often little known topics and strives to make them entertaining by focusing on beautiful presentations, engaging narratives...and maybe a little humor too. We produce ... Mustard is a condiment made from the seeds of a mustard plant, which may be the white/yellow mustard (Sinapis alba), brown mustard (Brassica juncea), or black mustard (Rhamphospermum nigrum).