Vegetable Broth (Best Option)
1/4 cup per 4 egg yolksVegetable broth works well because it provides a gentle umami flavor that complements the creamy custard without overwhelming it. The broth’s mildness ensures the caramelized sugar topping remains the star. From a food science perspective, the broth’s water content and mild solutes maintain the custard’s proper coagulation and texture.
For best results, use a low-sodium, clear vegetable broth to avoid adding excess salt or cloudiness. Avoid broths with strong herb or spice notes that can alter the dessert’s flavor profile.
Compared to beef broth, vegetable broth yields a lighter, more neutral custard that still benefits from savory depth, making it a superior substitute in this sweet application.