But crème fraîche tastes of basically nothing and has little texture. Often sandwiches could do with a bit of salt and fat. I thing the texture of a hard cheese

But crème fraîche tastes of basically nothing and has little texture. Often sandwiches could do with a bit of salt and fat. I thing the texture of a hard cheese is works quite well and gives a sandwich a bit of bite (though it is still reasonable to have a soft cheese in a sandwich)