Pour lentils into a fine mesh sieve and rinse under cold water. Transfer to a heat proof bowl and cover with boiling water. Let sit while you prepare the rest of the salad, or at least 30-40 minutes until they are tender but still maintain a slight bite.

Combine scallions, ginger, salt, sugar, and vinegar in a small bowl. Slowly add the olive oil, whisking continuously until incorporated.

Combine broccoli, cabbage, arugula, radishes, cherries, and sunflower seeds in a large bowl. Drain lentils and add to the vegetables. Pour dressing over the top and toss to combine. Taste and add more salt if needed.