Cook rice in water at slow boil for 5 to 10 minutes to evaporate some water and soften rice. Pour in milk, cook uncovered on low heat until creamy in texture. Stir to avoid sticking. In a bowl, combine eggs and sugar. Remove rice from heat, stir in the egg-sugar mixture. Return the pot to the heat for 4 to 5 minutes. Turn off the heat. Stir in the vanilla and drained raisins.