I find that the gefilte fish gelatin works best with white horse radish.
I not that the clam chowder was not specific. New England or Manhattan?
---Why, New England, of course. White clam chowder has a milk basis which means casseine. Casseine makes an excellent photographic substrate. Squashed tomatos are likely to yield inferior images.
Soya beans are surprisingly effective though.
Dan Shapiro