Place the diced eggplant in a nonreactive, medium heavy pot (such as a Dutch oven). The eggplant should not come more than halfway up the sides of the pot.
Step 2
Mix the sugar, salt, orange zest, and spices together, and sprinkle over the eggplant. Cover, and set to rest overnight in your refrigerator.
Step 3
When ready to cook, add the water, stir to mix, and transfer the pot to your stovetop. Heat to a boil over medium-high.Immediately reduce the heat, and allow the mixture to simmer gently, stirring occasionally, until the eggplant is uniformly soft and jammy, 90 minutes to 2 hours.
Step 4
Remove from heat. Use an immersion blender or food processor to smooth the mixture to a rough purée (you still want some texture—it should be the consistency of strawberry preserves. Do not use a high-powered blender on a high speed).
Step 5
Add the lemon juice and stir with a wooden spoon. Taste and adjust the seasoning, adding more sugar or lemon juice as you prefer. Use immediately or transfer to the refrigerator to chill until ready to use.