Vegetable Broth (Best Option)
1 cup vegetable broth per 1 cup chicken brothVegetable broth contains a blend of aromatic vegetables and seasonings that mimic the savory and umami qualities of chicken broth, making it a suitable plant-based alternative. The natural glutamates in vegetables like mushrooms, celery, and carrots contribute to the umami flavor that tomato sauce benefits from.
To ensure the best results, use a low-sodium vegetable broth to control salt levels and avoid overpowering the sauce. Taste and adjust seasoning as needed since vegetable broth can vary in intensity.
Compared to chicken broth, vegetable broth produces a slightly lighter and fresher flavor in the tomato sauce, which can enhance the natural brightness of the tomatoes without adding meatiness.