Made from coconut sap, coconut aminos are a gluten-free, soy-free soy sauce alternative. It’s sweeter than soy sauce. If you don’t have it on hand, you can replace it with low-sodium tamari or soy sauce, but not 1:1 as these are much saltier than coconut aminos. I would suggest halving the amount of tamari or soy sauce and cutting it with some water to reach the same amount.