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Step 1: Assemble Your Supplies
Once I was done eating this particular citrus I saved the seeds and soaked them for a day or so in a glass of water.
Step 2: Preparing the Seeds
Once I had soaked my citrus seeds overnight and set them on the paper towel which I moistened I folded the napkin in half and set it inside the plastic sandwich bag which I sealed. Then I found a very warm spot for them in my bedroom. Since it's winter I take advantage of the heater we have running and place my seed baggies near a vent. The warmth from the heating vent helps with germination especially in the middle of winter when temps aren't really optimal for seed starting.
Step 3: What It Should Look LIke
Step 4: They're Growing
At this point I should tell you that it will be a number of years before your citrus tree gets big enough for it to flower and fruit. But if you're a patient person or just growing for the fun of it that shouldn't be a problem for you. You can use this method to start a whole collection of citrus trees from seed to grow in your home or yard. Next time you're in the grocery store look for Key Limes, Calamondin Oranges, Kumquats, Mandarins and give them a try. If your store doesn't have a large variety of citrus available check out some of the ethnic grocery stores in your areas and discover a whole new world of fruits and veggies.
If you're not interested in growing citrus from seeds then you can use this method to start any kind of seeds that you are interested in. But I'd suggest sticking with larger seeds because they'll be easier to pick out and transplant into pots when they've sprouted. If you find that your bag retains a lot of moisture while you're waiting for your seeds to sprout open it for a few hours a day and let a little of the excess moisture evaporate.