Water with a pinch of salt (Best Option)
1 cup water + 1/8 teaspoon salt per 1 cup vegetable brothVegetable broth in chocolate cake recipes mainly serves to provide moisture and a mild savory background that balances sweetness. Using water with a small amount of salt replicates the moisture content and the slight savory note without introducing conflicting flavors. Salt helps to enhance the chocolate flavor and overall sweetness perception.
To ensure success, dissolve the salt fully in the water before adding it to the batter. Avoid adding too much salt as it can overpower the cake's sweetness. This substitute works best when the broth is not a major flavor component.
Compared to vegetable broth, this substitute results in a clean, neutral taste that allows the chocolate to shine, preserving the intended flavor profile of the cake.