Vegetable Broth (Best Option)
1 cup vegetable broth per 1 cup beef brothVegetable broth contains a variety of umami-rich vegetables like mushrooms, onions, and carrots that provide a savory base similar to beef broth. The natural glutamates in these vegetables enhance the tomato sauce's flavor complexity.
To maximize flavor, use a high-quality or homemade vegetable broth with a rich vegetable concentration. Avoid overly salty or bland broths to maintain balance.
Compared to beef broth, vegetable broth results in a slightly lighter sauce but preserves the essential savory backbone, making it an excellent plant-based alternative.