Combine the sugar, vinegar, water, salt, mustard seeds, and ginger in a saucepan over medium heat. Heat until sugar dissolves.
Add the sliced habaneros and simmer gently for about 10 minutes.
Use a slotted spoon to transfer peppers to a clean jar.
Simmer the liquid another 5–10 minutes to reduce slightly, then pour over the peppers.
Cool, then refrigerate. Let them sit a day or two before using for best flavor.
Enjoy!
Video
Notes
Storage Keep the candied habaneros in sterilized jars for longer shelf life. You can sterilize jars by boiling them for 10 minutes or washing them in a dishwasher with a sanitize cycle. Store in the refrigerator for up to 1 month or freeze for up to 3 months.