A satisfying salad is all about a combination of textures: here, crisp greens, juicy citrus, silky salmon, and rich avocado.
Preheat oven to 375 degrees. Season salmon with salt and pepper. Place in a 9-inch baking dish. Drizzle with 1 tablespoon oil and sprinkle with half of scallions. Bake until salmon is partially opaque in center, 10 to 12 minutes. Transfer to a dish and let cool.
Break salmon into large pieces and divide among serving dishes. Top each with grapefruit, avocado, greens, and remaining scallions. Season with salt and pepper. Whisk remaining 2 tablespoons oil with lime juice and season with salt. Drizzle dressing over each salad.