I beg to differ ~ haggis probably is necessary if you want to become a more authentially Scottish perfomer (even just a little bit more authentic).

I know I certainly became a much better blues singer after my first exposure to grits and collard greens. ;^)

Don't be put off by lurid descriptions of what haggis is made from. Do you eat sausage of any kind? Imagine your favorite sausage, or pate, etc. ~ believe me, if anyone had described the contents to you first, you would have been reluctant to ever take your first taste; but it's good, isn't it?