Two old beefsteak tomatoes, half covered in an equal mix of water and stock. I added salt, one slice of ginger, and a couple of small garlic cloves, and possibly a dash of sesame oil - I forget.
I'll boil it down. Tomatoes often want sweetness so I used a pan I'd just cooked strawberries in. I emptied it but didn't wash it reasoning that the little bit of strawberry would add a subtle flavour to the sauce.
I may add this to the asparagus soup.... keep you posted. [update] Nope, used it on top of crispy noodles. Tasters loved it. Tons of umami.
We garnished it with fresh basil, lavender, oregano and rosemary from the garden.