Put the quinoa in a sieve and rinse very well with cold water; shake gently to drain the excess water. Transfer the quinoa to a medium saucepan and add 1 1/2 cups water and 1/2 teaspoon salt. Bring to a simmer over medium-high heat, then cover, reduce the heat to low, and cook until all of the water is absorbed, about 16 minutes. Keep covered, off the heat, for 5 minutes then uncover and cool slightly.
Meanwhile, toss the sweet potatoes with the oil, coriander and 1/2 teaspoon salt and spread on a rimmed baking pan in a single layer. Bake until just tender and browned in spots, about 20 minutes. Add the beans, soy sauce and hot sauce to the pan and stir to mix.
Spoon the quinoa into bowls and top with the sweet potato-black bean mixture. Top with avocado and pumpkin seeds and drizzle with the dressing.
Yield:About 3/4 cup
Whisk the yogurt, parsley, lime juice and garlic together in a medium bowl and season with salt and pepper to taste.