Preheat the oven to 300°F (150°C).
Wash the habanero peppers and remove the stems. Wash and halve the peaches, then remove their seeds.
Arrange the peppers and peaches, cut side up, on a baking tray and roast for 1 hour. Be sure to vent your kitchen well, as roasting hot peppers can be intense. (If smoking instead, cook at 250°F (120°C) for 2–3 hours.)
Once cooled, transfer the roasted peppers and peaches to a blender, along with the sea salt, garlic, ginger, maple syrup, carrot, mustard powder, and apple cider vinegar. Blend until smooth, working in batches if necessary.
Taste the sauce and adjust salt to your preference. Stir in the fresh lemon juice to finish.
Pour into sterilized glass jars and store in a cool, dark place or refrigerate. The sauce will keep for 6–10 months in the fridge.
(You can cook the blended sauce before bottling, but it doesn’t significantly affect shelf life or flavor.)