1. Preheat your oven to 400°F.
2. Peel the sweet potato and cut it into 1/2-inch cubes.
3. Toss the sweet potato cubes with 1 tbsp olive oil and half of the sea salt and black pepper on a parchment-lined baking sheet.
4. Roast for 20-25 minutes, flipping halfway through, until the potatoes are tender and golden brown.
5. Pat the sole fillets dry with a paper towel and season both sides with the remaining sea salt and black pepper.
6. Heat the ghee in a large non-stick skillet over medium-high heat.
7. Carefully place the sole in the pan and sear for 2-3 minutes per side until the fish is opaque and flakes easily with a fork.
8. In a small bowl, whisk together the extra virgin olive oil, lemon juice, and Dijon mustard to create a vinaigrette.
9. Place the mixed greens in a bowl and toss gently with the prepared dressing.
10. Plate the pan-seared sole alongside the roasted sweet potatoes and the fresh garden salad.