getting curacao orange proved to be very difficult up here (Qld). I gave up before I succeeded.
I have tried using dried sweet orange peel. Result was quite drinkable, but quite different to Hoegaarden. (Used Hoegaarden yeast)
Was able to find curacao essence in a HBS (went under the name Triple Sec essence, or something similar). Used that. Again, result was quite drinkable, but quite different to Hoegaarden. But I didn't use unmalted wheat in the recipe (only malted wheat and malted barley), and perhpas most importantly, I didn't use any unmalted oats (necessary for both the white cloudiness and the mouthfeel of the result). But, if what you want is EXACTLY Hoegaarden, this is available at $16 a fourpack from the local
My next attempt at this will use the zest of a kaffir lime, and I will probably go to the trouble of the oats thing (but need other grains as well, because no enzymes in rolled/cut oats).
btw Remember that you are looking for coriander SEED, not fresh/dried coriander leaves (commonly called cilantro overseas).
peterd