Khreynbow Pride כרײנבױגן שטאָלץ
|Romaine lettuce, Radicchio di Treviso, Belgian endive, beet khreyn, carrot khreyn, yellow pepper khreyn, avocado khreyn, pleyn khreyn, purple cabbage khreyn|
Peysekh, of course, Shabes Noyekh and Pride Shabbat are special khreynbow occasions
The recipes for all the horseradish preparations in the khreynbow are here .
I have not given up on finding an ingredient for blue khreyn, and I was momentarily cheered by this article, about the uses of the butterfly pea flower, but the flower turns purple when exposed to acid, and even without the vinegar, the horseradish itself would be sufficiently acid to trigger the change. I might still try this.