I'm looking for a source of the umami flavour to add to various dishes. However, since I became vegetarian I can't think of a good source for the flavour.
I used to use Worcestershire sauce, or Nam Pla (fish sauce). I can't think of a vegetarian source of the flavour in the same vein though.
I've tried soy sauce, and it does work, but it imparts too much saltiness to the dish.