In a large wide casserole or heavy sauté pan that has a tight fitting lid, heat 4 tablespoons olive oil over medium heat. Once hot, add the onions and sauté, stirring occasionally, for about 20 minutes. The onions will first soften and become translucent and then they will brown, which is what you want. Stir and make room in the middle, add the remaining olive oil, and add the rice. Cook for 2 to 3 minutes, gently stirring with the browned onions. The rice will quickly change from a grayish white to a bright white color and feel heavier in the spoon. Don’t let it brown. Make room in the middle once again, and add the cooked lentils, cumin, oregano, ground ancho chile, turmeric, coriander and salt, and stir well. Add the broth, bring to a boil, reduce the heat to the lowest possible setting, cover, and cook for 20 to 25 minutes, until most or all of the liquid has been absorbed and the rice is cooked. Remove the lid and check to see that the rice is cooked. If it is, fluff with a fork, and serve. If it is still a bit al dente, add a couple of more tablespoons of water, cook for a few more minutes, and test.