Saute onion in oil in large skillet until soft. Add rice; cook, stirring, several minutes. Combine tomato paste, water, cinnamon and lentils in a bowl; add to rice.
Bring mixture to a boil; cover tightly, reduce heat and simmer 30 minutes. Stir in seasoned salt, raisins and pinenuts. Grease an 8-inch square baking dish; pour in rice mixture. Cover and bake in preheated 350 degree oven for 20 to 30 minutes.