Mix the 2 cabbages together in a large colander. Salt cabbage generously and put in the sink to drain for about 1 hour. Rinse cabbage under cold water and pat very dry. Mix the carrot with the cabbage.
Toast celery seeds in a dry skillet over medium heat; cool. Whisk the mayonnaise, mustard, brown sugar, pineapple juice, buttermilk, celery seeds, 1 teaspoon salt, pepper, to taste, and cayenne in a large bowl. Add the cabbage, tossing to coat. Serve immediately or refrigerate until needed.
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