03Add the onions, sprinkle with a dash of salt and cook until they turn dark caramel brown, stirring often. This will take about 15 minutes. Splash the onions with a little water if they stick to the bottom of the pan. You'll know they're done both by their deep chestnut color and by the slight crispiness developing on some of the onions.04Using a slotted spoon or spatula, remove about half of the onions to a paper towel-lined plate; these are for garnish later. Sprinkle in the ground cumin, cayenne and then add the cinnamon stick; saute about 1 minute.05Add the rice and cook, stirring often (but gently so you don't break the rice!) until some rice grains start to brown. Quickly, add the cooked lentils, 3 cups of water and 1 1/2 teaspoons of salt; bring to a boil. Turn the heat down to low so that the pan is at a simmer, cover and cook 30 minutes. The water should be completely evaporated and rice should be tender. (If there's still too much water in the bottom, put the lid back on and cook for another 5 minutes.)06Turn off the heat, keep the lid on, and allow the rice to steam undisturbed for about 5 minutes.07Meanwhile, toast the pine nuts, if using, in a small skillet over medium-low heat, shaking often, about 5 minutes.08Taste the rice for seasoning. Serve with the reserved caramelized onions, toasted pine nuts, if using, and a little squeeze of lemon juice. I also like to serve this with some dollops of Greek yogurt.