Tamari (Best Option)
1:1Tamari is a Japanese soy sauce variant that is typically gluten-free and made with little to no wheat, making it suitable for gluten-sensitive diets. It contains the same fermented soy base, providing a comparable umami and salty profile essential for marinades.
When using tamari, ensure it is well mixed into the marinade as its slightly thicker texture can affect absorption rates. Taste and adjust salt levels if necessary, as some tamari brands are less salty than traditional soy sauce.
The final marinade will retain the characteristic dark color and savory depth expected from soy sauce, making tamari the closest and most reliable substitute in both flavor and function.