If you have a rice cooker that cooks quinoa, feel free to use it for cooking your quinoa. On the stovetop, bring the stock up to a boil. Add the Aji Powder, bay leaf, dried lime if using, salt and pepper, to taste. This liquid must be flavorful; it will flavor the quinoa.
Add the quinoa, stir, and lower the heat to low. Place a lid on the saucepot and cook the quinoa for 25 to 30 minutes, or until the water is absorbed. Set aside for 5 minutes, then fluff with a fork. Discard the bay leaf and lime. Keep warm until ready to serve.
While the quinoa is cooking, heat the oil in a large, shallow skillet over medium heat. Add the carrots, potato, and a pinch of salt and pepper, tasting and adjusting as needed. Add the Aji Powder, cumin, and chili powder.
Cook, stirring often, until the potatoes and carrots are just softening, approximately 10 minutes.
Add the cabbage and onion. Cook, stirring often, for 5 minutes, softening the vegetables. Add the tomatoes, lemongrass, ginger, and garlic. Stir well.
Simmer the vegetables, uncovered, until the potatoes are tender.
Serve the veggies over the quinoa and top with cilantro and lime wedges.