Take the head of broccoli and chop into small, bite sized florets then pop them all into a large bowl. I also use the stalk and chop it up finely and add that in. 

Grab a frying pan and cook the chopped bacon until it's cooked to your liking. I like mine nice & crispy.  Set aside to cool. 

Mix together the mayo & mustard. Add your red onion & mayo mix to the broccoli & toss well, making sure the broccoli is coated well. Top with the bacon and mix through. 

Serve and devour.