Preheat the oven to 400 degrees F. Place the sweet potato fries into a mixing bowl and add the oil and seasonings, and toss to coat. Lay them out on a baking sheet, without touching each other. Bake for 15 min, then flip and bake another 15 to 20 minutes until tender and slightly crisp.
Meanwhile, heat a large pan over medium heat. Add the oil, ground meat substitute, and red onions, and cook for 5 minutes, stirring periodically. Then add the brussel sprouts, salt, pepper, cumin, dried oregano, and cook another 5 minutes, partially covered.
During this time, prepare the Tahini Sauce by adding all of the ingredients except the water into a bowl. Whisk thoroughly and add the water in slowly while stirring, to reach desired consistency.
Add the white wine and cook until the brussel sprouts are fork tender, allowing the liquid to mostly evaporate. Add the stone ground mustard and stir through. Serve with the sweet potatoes and top with the Tahini Sauce and chopped dill.