Sociale San francisco Bread

I recently visited this fine establishment and tried their complementary bread. Has anyone who has tried the bread know how they're getting that flavor? It's quite honestly the most flavorful bread I've ever had. It tastes like.....bread (no herbs, garlic, cheese etc), I don't know any other way to describe it. The baguette's insides are soft and pale white so I'm going to assume they're using fats/eggs, but it's not the texture that I want it's the flavor of the bread that I'm after.