It seems like I've been living high off the hog lately (or at least been eating too much beef), so last night I went vegetarian. I topped some egg noodles with mushrooms and sauce. I sauteed some sliced button mushrooms in a couple of tablespoons of olive oil until they were cooked through, then added half a cup of water, and shoyu and mirin to taste. This cooked down into a sweet sauce not unlike that in simmered hijiki with abura-age, a similarly light vegetarian dish. There was no recipe involved; it was just a matter of taking available ingredients and doing something simple with them.
I should insert the usual comments about tinkering with the seasonings because the sauce was a little on the sweet side, but I did find it tasty, and it served its mission of being a light yet satisfying dinner.