Pour red beans, quinoa, and all remaining ingredients except scallions into a large saucepan or dutch pot. Bring to a strong simmer over medium-high heat for about 5 minutes. Reduce the heat to medium-low and cover with a lid, cooking for an additional 40 minutes. When quinoa is cooked, all liquids should be fully absorbed. Turn off heat and add sliced scallions to the pot. Cover with a lid and allow to set for 10 minutes. Gently fluff with a fork to incorporate scallions.