Broccoli and the Beast

It's lunch time and I chop or slice different green vegetables as I have done many times.  I let the kids choose which vegetable they want.  I have done this so often, I no longer have to ask because I know which vegetables they like and have chosen in the past so this time, I just give Brianna broccoli because EVERY other time I have given her the choice between cucumbers, green peppers or broccoli, she ALWAYS chooses broccoli and she always eats it just fine.  Well, today she decided she "didn't like" broccoli and the beast has been unleashed.  The rule is that they have to eat their vegetable if they want anything else to eat the rest of the day.  She simply refuses ALL day long to eat a few little pieces of broccoli and makes the entire day miserable for us all.  sigh. . . .