For those looking for the Dried Bitter Orange Peel:
I've visited and rang everwhere from organic food suppliers, herb places, health food stors etc and can't find it.
Hoegaarden definitely use this exact thing in their beer.
Bitter orange peel comes from what's called
Seville Oranges.
I'd suggest you buy some of those, skin them and dry the peel in the usual fashion.
How to dry orange peel
Buy organic versions (pestiside free) - if you can't, get the ususal version and wash using a scrubbing brush.
Skin them, leaving the white part behind.
Lay them skin down on a plate on the kitchen bench for three or four days, or until fully dry.
Presto! Put them in a jar and keep in a dark place (your spice cupboard should do). Weigh this out to 14g per batch when you're ready to make your beer.
At the end of the day, it's not much more work as you'd have to skin the ususal oranges anyway - with this, you just use a different type of orange and start a few days earlier