Vegetable Broth (Best Option)
1 cup vegetable broth per 1 cup beef brothVegetable broth contains a blend of aromatic vegetables and sometimes mushrooms, which provide umami compounds similar to beef broth, making it a suitable plant-based alternative. The presence of natural glutamates helps preserve the savory depth in the cream sauce.
To ensure success, use a low-sodium or homemade vegetable broth to control salt levels and avoid overpowering the sauce. Taste as you go, since vegetable broths can vary in intensity.
Compared to beef broth, vegetable broth results in a slightly lighter flavor profile but retains the necessary savory foundation, allowing the cream and other sauce components to shine.