Preheat oven to 400°F.
Peel and dice the sweet potato into cubes. Toss with a bit of olive oil, salt, and pepper, then spread onto a baking sheet.
Roast the sweet potato in the oven for 20-25 minutes until tender and lightly caramelized.
Meanwhile, season the salmon fillet with salt, pepper, lemon juice, and a sprinkle of herbs. Sear it in a heated skillet over medium-high heat for about 3 minutes per side until cooked through and lightly crispy on the edges.
Prepare the salad: In a large bowl, combine mixed greens, halved cherry tomatoes, and thin slices of red onion.
To make the creamy tahini dressing, mix the tahini, lemon juice, minced garlic, a splash of water to reach desired consistency, and season with salt and pepper.
Assemble the salad by gently tossing the roasted sweet potato cubes and the seared salmon (flaked into bite-sized pieces) with the mixed greens.
Drizzle the creamy tahini dressing over the salad, toss once more to coat, and serve warm.