In a medium saucepan, heat olive oil over medium high heat, Add oranges and cook for 2 to 3 minutes. Pour in stock, salt, cumin, sugar, rice, and 3 cups of water then reduce heat to low and cover. Simmer for 30 to 45 minutes, stirring occasionally, until liquid is absorbed and rice is cooked (You may need to add more water during cooking). Mix in cilantro when rice if finished cooking and remove from heat.