Or, really, it's purple. And while we're talking about colors, some people refer to green cabbage as white cabbage.
But I digress.
While green cabbage and red cabbage taste pretty much the same, they're often used in their own specific recipes - green cabbage ends up in cole slaw, sauerkraut, and stuffed cabbage, while red cabbage is often used for a braised sweet-sour recipe that shows up as a German side dish, right next to the spaetzle.
The little secret ingredient in this slaw is the horseradish - it gives the slaw a little bit of a kick - but it's subtle. The slaw shouldn't be spicy - it should just be less-than-bland.
Commercial prepared horseradish varies in strength, so feel free to adjust as needed. Start small and add more, after you taste it.
Red Cabbage Slaw
1/2 medium head red cabbage
1/4 cup cider vinegar
1 teaspoon salt
1 teaspoon sugar
1 teaspoon prepared horseradish
1/4 cup Greek yogurt
1/4 cup mayonnaise
Cut the cabbage as desired some folks like thin shreds while other prefer a chopped slaw. Place in a large bowl.
Add the cider vinegar, salt, sugar, and horseradish. Stir to combine. Set aside at room temperature for an hour, stirring occasionally. The cabbage will lose liquid and soften just a little.
Drain the liquid from the slaw and add the yogurt and mayonnaise. Stir to combine. Taste and adjust seasoning as needed. If you prefer a creamier slaw, add more yogurt and/or mayonnaise.
You can serve immediately, or refrigerate until needed. The dressing will be white when first mixed, but it will turn pink/purple as it sits.