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"Plomeek Soup" is also described and referenced in later Trek renditions. See Plomeek Soup.
A internet search will bring up many other recipes for this soup, most which produce a soup that is orange in color.
some more recipes for Plomeek delicacies, from The Trekker Cookbook
A Fan Thought About Soup
In 1998, a fan celebrated K/S Day with some food: "Originally I'd planned to fix a Vulcan meal to honor Spock but would you believe it - the local market was completely out of fresh plomeek, and that canned stuff is no good at all. Somehow split pea just didn't seem like a viable substitute, so I decided I'd have to settle for a nice leafy green salad..." 
- from The K/S Press #20