Preheat your oven to 425°F (220°C).
Wash the sweet potato and cut it into small cubes to increase crispiness. Toss the cubes with a pinch of salt, pepper, and half of the olive oil.
Spread the sweet potato cubes on a baking sheet in a single layer and roast for about 20-25 minutes, until edges are crispy.
While the sweet potatoes roast, prepare the salmon. Place the salmon fillet on a lined baking tray.
In a small bowl, combine the juice of half a lemon, chopped fresh dill, minced garlic, the remaining olive oil, a pinch of salt, and pepper.
Drizzle the lemon herb mixture over the salmon fillet, ensuring it is evenly coated.
Once the sweet potatoes are nearing done or after about 10 minutes of sweet potato roasting, place the salmon in the oven and roast for 12-15 minutes until the salmon is flaky and cooked through.
Plate the salmon alongside a serving of the crispy roasted sweet potatoes and garnish with an extra sprinkle of fresh dill if desired.