Using a very fine sieve, rinse the poppy seeds under running water. Drain very well. Transfer the poppy seeds to a small saucepan and pour in about 3 cups of water. Over medium heat, bring the water to a gentle simmer, then turn off the heat immediately. Allow it to sit for 20 minutes to half an hour. Turn the heat onto medium again and bring to the point of simmering. Turn off the heat once again and allow to sit for 20 minutes.