PREHEAT oven to 400°F. Line 2 large-rimmed baking sheets with parchment.
SPREAD chickpeas on one baking sheet and the sweet potato and onion on the other. Drizzle the chickpeas with 1 tablespoon of the olive oil and the vegetables with 2 tablespoons of the oil; toss to coat.
IN a small bowl, stir together the salt, paprika, cinnamon, cumin, pepper, and turmeric. Sprinkle the seasoning over the chickpeas and vegetables and toss to coat.
BAKE both sheets for 20 to 30 minutes, until the sweet potato cubes are tender and browned and the chickpeas are golden or slightly darker.
MEANWHILE, place the kale in a large bowl and drizzle with the remaining tablespoon olive oil. Massage for 1 minute to soften, then make the dressing.
IN a food processor, combine all dressing ingredients. Cover and process until smooth.
ARRANGE the chickpeas, roasted vegetables, kale, and radishes in 3 shallow serving bowls. Drizzle with the dressing and sprinkle with the hemp hearts (see tip below).
TIP: Toasting hemp hearts adds a nice crunch and lightly toasted flavor to your dish. To toast, place the hemp hearts in a dry skillet or pan over low heat. Shake the pan until they just start to color, then remove when they’re a light golden brown.