
I think the original (Pierre Celis) Hoegaarden recipe asked for Curacao orange peel , interesting read here,
Little tip , I use a peeler , same as the one used to peel carrots and stuff , works a treat , just removes the peel ...no pith babyBy the 1600s, crops of bitter Seville Oranges had been established on Curaçao Island in the Caribbean. (The Senior & Co. company, which makes Curaçao liqueur today, maintains that the oranges brought over were Valencia Oranges, and that the oranges evolved into bitter ones over time. This would have required the trees switching botanical genus, from the sweet Citrus sinensis to the bitter Citrus aurantium.) In any event, though the trees there started from Seville Oranges, they have now been recognized as being slightly different and so have acquired their own botanical name.

Andy