⭐ Mushroom Broth (Best Vegan Option)
1/4 cup per 1/4 cup vegetable brothMushroom broth contains natural glutamates that provide umami, which mimics the savory depth of vegetable broth. This helps maintain the complexity of the Béarnaise sauce's flavor profile, especially complementing the tarragon and shallots.
When using mushroom broth, ensure it is well-strained to avoid any sediment that could affect the sauce’s smooth texture. Also, use a mild mushroom broth to prevent an overly earthy taste.
Compared to vegetable broth, mushroom broth offers a slightly deeper flavor, which can enrich the sauce without altering its classic character, making it an excellent direct substitute.