Originally Posted by sfrisby
Probably won't have much flavor left after 30 min boil. I'd suggest 5 min or less in boil to sanitize or soak in cheap vodka to sanitize for a few days then add after fermentation dies down.
Flavor from zest comes from the oils and with 30 minutes you should have boiled them all away. You only need to pasteurize the zest, not sterilize it so wait until flame out to add it or do the soak. Personally I would wait to add it until the fermentation is done so the CO2 didn't scrub out the aroma. If you want more orange flavor research corriander seeds.