I know exactly what you mean about finding it challenging to write out recipes when you don't measure. I rarely do. Something I think is important is for other people to think about cooking a little more loosely, as we do...just believe it will turn out and have a little faith in your ability. I think it's more fun that way anyhow!
Unctious is a good word for this. Lots of umami because of the caramelized onion. I want to make it again soon...it's all gone!