Soy Sauce with Lime Juice (Best Option)
1 tablespoon soy sauce + 1 teaspoon fresh lime juice per 1 tablespoon fish sauceSoy sauce provides a rich umami and saltiness similar to fish sauce, while lime juice adds the bright acidity that fish sauce naturally has. This combination balances the savory and tangy notes needed in pasta dishes, especially those with olive oil or tomato bases.
To ensure success, use low-sodium soy sauce to avoid excessive saltiness and add lime juice gradually to prevent overpowering the dish. Stir well to integrate flavors evenly.
Compared to fish sauce, this substitute is less pungent and fishy, resulting in a milder but still flavorful umami boost that complements pasta without dominating it.