Preheat the oven to 425ºF.
Prepare sweet potatoes: Scrub and dry the sweet potatoes before placing them in a large bowl. Add a drizzle of olive oil, and a dash of salt. Rub the skins until evenly coated with the oil. Use a fork to prick each one several times evenly. This allows the steam to escape.
Roast sweet potatoes: Place the potatoes on a baking sheet in a single layer, leaving space between them. Bake for 40 minutes, flipping halfway. Check for doneness by squeezing one of the potatoes in an oven mitt-protected hand and inserting a sharp knife into the center. They should feel quite soft, and the knife should glide all the way through without resistance. If not, cook until tender. Set aside to cool until they can be handled comfortably.
Chickpeas and tempeh: (Optional: Rub the chickpeas between the layers of a kitchen or paper towel. This gets them extra crispy.) Transfer the tempeh and chickpeas to a large rimmed baking sheet. Add the olive oil, garlic, paprika, and salt. Toss to coat. Bake them with the potatoes for about 15 minutes, or until crispy and golden brown, tossing halfway.
Kale: Transfer the kale to the bowl used for the potatoes. Add olive oil and salt, and massage until just softened.
Dressing: Add the tahini, cumin, salt, and lemon juice to a medium bowl. Grate or press the garlic into the bowl. Add the ice-cold water 1 tablespoon at a time until the desired consistency.
For serving: Slice the sweet potatoes open. Fluff the inside with a fork. Then top with kale, chickpeas, tempeh, and the desired amount of dressing.