While florets are roasting, grate stems onto a plate (pieces should resemble rice). Heat coconut oil in a large pan; add onions and remaining ½ teaspoon salt, stirring well. Cook on high heat, stirring often, until translucent and lightly browned. Add parsnips and grated cauliflower stems, and continue stirring for 5 minutes. If mixture becomes too dry, add a tablespoon of water from time to time. (You may need as much as ¼ cup water.) As soon as parsnips are tender, remove from heat and stir in remaining ¼ teaspoon pepper, pecans, sage, thyme, 2 tablespoons parsley, and broth. Add about half of the roasted cauliflower and toss well. Pack mixture into a 9×13-inch baking dish.