¼ cup scallions, white and some green parts, thinly sliced, soaked in water and drained
⅓ cup cilantro leaves
1 to 2 fresno chiles, seeded, sliced into thin rings
¼ teaspoon ground sumac
Directions
Preheat the oven to 350°F. Roast the sweet potatoes until just tender, about 40 minutes. A cake tester or knife should meet a hint of resistance, but not much—they will keep cooking from their own heat and you'll be grilling them before serving. Let cool, then peel and slice the potatoes into ½-inch slices.
Meanwhile, make the sesame yogurt: Whisk all the ingredients together in a small bowl and set aside in the refrigerator.
Make the dressing: Whisk all the ingredients together in a small bowl and set aside.
Make the dukkah: Combine all the ingredients together in a small, dry container and set aside.
Heat a grill pan (or start a wood or charcoal fire). Lightly brush the sweet potatoes with oil and season them with salt and pepper. Put them on the hot pan and cool until they have grill marks on one side, then flip and repeat on the other side, about 5 minutes each side. Remove from the grill and place into a bowl.
Add the watercress, scallions and cilantro to a bowl, and dress with some of the dressing. Add a heaping tablespoon of sesame yogurt to each serving plate, spreading it out with the back of a spoon. Top with the sweet potatoes, citrus segments, greens, chiles, dukkah and sumac, then serve.