I bought a bottle of Vietnamese fish sauce (Red Boat brand, the most recommended brand) and added a teaspoon to some pea leaves. I loved the resulting flavor, but my partner did not and complained that it had too much of a fishy smell. A lot of cooking techniques actually seek to remove this fishy smell even when cooking fish, so it was not welcome to add this to something that didn’t contain fish in the first place. It’s certainly not a flavor everyone would like.