Slow Cooker Root Vegetable Tagine

1 pound parsnips

peeled and diced

1 pound turnips

peeled and diced

2 medium onions

chopped

1 pound carrots

peeled and diced

6 dried apricots

chopped

4 pitted prunes

chopped

1 teaspoon ground turmeric

1 teaspoon ground cumin

½ teaspoon ground ginger

½ teaspoon ground cinnamon

¼ teaspoon ground cayenne pepper

1 tablespoon dried parsley

1 tablespoon dried cilantro

1 (14 ounce) can vegetable broth