In a pot, bring water with eggplant, onion, and garlic to a light boil and let it simmer for 20 minutes. Then drain the vegetables, but save the water for later. Pour the cooked ingredients into a food processor or blender and blend until smooth. If the sauce gets too thick, you can use a couple of tablespoons of the flavored cooking water to get the consistency you want.
Egg Substitutions: There are many egg-free products and foods available to make your recipes free of eggs. Find out more about egg substitutions.