In a large bowl, combine the chopped green cabbage, red cabbage, bell peppers, onions, carrots, cauliflower, and green tomatoes.
In a saucepan, combine the apple cider vinegar, sugar, salt, mustard seeds, celery seeds, turmeric, and ginger. Bring the mixture to a simmer, stirring occasionally, until the sugar has dissolved.
Pour the hot vinegar mixture over the chopped vegetables and stir to combine.
Transfer the chow chow to sterilized jars or airtight containers, packing the vegetables down to remove any air pockets.
Allow the chow chow to cool to room temperature, then refrigerate for at least 24 hours before serving to allow the flavors to meld.
Enjoy the chow chow as a condiment on hot dogs, burgers, sandwiches, or as a topping for roasted meats and vegetables.