Good grief, Percy, I do believe you've done it!

[desperance]

I cannot speak to its flavour, neither to its effectiveness as an additive of soup - I must perforce leave such judgements to others - but I will tell you this: my watercress pesto is most vividly and gloriously green. Pure Green, it is: the thing itself, the essence, the distillation. That wavelength, quite unsmudged. I'd post a photo, if I only could.