Joe, I'm not much on soup recipes lately. I just get started and carry on. Here's what
(I think) I do.
I sweat chopped shallots in butter. I use shallots a lot and am not afraid to use lots. For 2 qt. of soup, I would use 3 large, at least.
I remove the main rib of the sorrel and rip the leaves up a bit. They disintegrate so thoroughly that the method really doesn't matter. I add the sorrel, probably 6 cups ripped, to the shallots in the pan, over low heat just let the sorrel 'dissolve' into their puddles. This takes only a couple of minutes. I then add chicken stock. (not a huge fan of veg stock). So that would be the 2 qt. Then salt and pepper. I let that simmer for about 15 minutes and that's it.
I've tried adding fresh tarragon and sometimes I like it, sometimes I don't.
I don't add any egg; we like it very simple. That's why I was thinking it would be 'clean' enough for the dinner that you have to follow it.
So, no recipe.
I get a crop in the Spring and another each Fall. Unfortunately, Fall's is coming up waaaay too soon.
Good luck with your dinner.