โญ Mushroom Broth (Best Vegan Option)
1/4 cup per 2 eggsMushroom broth is rich in natural glutamates, providing a savory depth that mimics beef broth's flavor profile. Its liquid form helps maintain the custard's moisture and texture.
Use a well-strained, low-sodium mushroom broth to prevent overpowering the delicate egg mixture. Avoid overly concentrated broths that can introduce bitterness.
This substitute imparts an earthier flavor, which can enhance quiches with mushroom or vegetable fillings, though it may slightly shift the traditional beef broth flavor profile.