Preparation Cook lentils in a large saucepan of simmering salted water until they are tender but still retain their shape, 20–30 minutes. Drain, rinse under cold running water, and drain well again. Mix yogurt, garlic, turmeric, 1/4 tsp. salt, and a generous grind of pepper in a small bowl to combine; set aside. Toss lentils, sunflower seeds, lemon juice, 3 Tbsp. oil, and remaining 1/2 tsp. salt in a large bowl. Gently fold in avocado, arugula, and basil. Spread reserved yogurt sauce across a platter and spoon lentil mixture on top; drizzle with oil.
Preparation Cook lentils in a large saucepan of simmering salted water until they are tender but still retain their shape, 20–30 minutes. Drain, rinse under cold running water, and drain well again. Mix yogurt, garlic, turmeric, 1/4 tsp. salt, and a generous grind of pepper in a small bowl to combine; set aside. Toss lentils, sunflower seeds, lemon juice, 3 Tbsp. oil, and remaining 1/2 tsp. salt in a large bowl. Gently fold in avocado, arugula, and basil. Spread reserved yogurt sauce across a platter and spoon lentil mixture on top; drizzle with oil.