⭐ Water with a pinch of salt and dried herbs (Best Vegan Option)
1 cup water + 1/8 tsp salt + 1/4 tsp mixed dried herbs per 1 cup vegetable brothWater is neutral and provides the necessary liquid to maintain the custard's consistency. Adding a pinch of salt and dried herbs mimics the seasoning and mild flavor profile of vegetable broth, preventing the quiche from tasting bland.
To ensure success, use fresh or good-quality dried herbs like thyme, parsley, or bay leaf. Avoid over-seasoning since the quiche filling ingredients will also contribute flavor.
Compared to vegetable broth, this substitute results in a slightly less complex flavor but preserves the quiche’s delicate balance and texture, making it the closest match without introducing unwanted flavors.