Start by soaking a paper towel with water, then squeeze out the excess water. Place the damp paper towel on a flat surface and smooth out any wrinkles. The paper towel should fit inside your plastic zippered or resealable bag. If the paper towel is too big, then fold it in half or into quarters. Seeds from non-organic lemons will not always sprout, so it is a good idea to prepare at least 10 seeds to ensure you have a healthy selection. Look for seeds that are large and plump. Skip the ones that look shriveled or like tiny, white specks. These will either not sprout, or they won't grow into a healthy seedling.  Even if you only plan on growing one lemon tree, it is a good idea to start with several seeds. Not all seeds will sprout, and not all seedlings will survive. Take care to not crowd the seeds. They should be at least three inches apart, so that they have room for their roots as they germinate. This will keep the seeds from drying out while you work. The seeds must stay moist. If they dry out, they will not sprout. You can do this by rinsing the seeds in cool water, or by sucking on them. This gel is filled with sugars, which can encourage mold and bacteria growth. Start peeling from the pointy end. You can use your finger nail or a craft knife to nick the tip, and then peel the outer shell down. This will make it easier for the seeds to sprout and speed up the process, but is not necessary for germination to occur. You may notice that your seed is covered with a thin, brown film. Use your fingernail to scratch this coating off. Try to spread the seeds out as evenly as you can, so that the roots don't become tangled when they sprout. Once the seeds are on the paper towel, they should stay damp. If you notice them starting to get dry out, consider covering the paper towel with another damp paper towel, or folding the first one overtop of them. Don't use a plastic grocery bag. You want the bag to be zippered or resealable; this will help trap the moisture and retain heat. Your seeds will need both in...

TL;DR in Vietnamese:
Làm ẩm khăn giấy và trải phẳng ra. Lấy 5-10 hạt mẩy từ quả chanh hữu cơ. Cân nhắc để hạt trong cốc nước qua đêm. Rửa sạch lớp màng giống như chất gel bên ngoài từng hạt. Bóc lớp vỏ ngoài màu trắng và để lộ hạt màu nâu bên trong. Bóc cả phần vỏ màu nâu. Đặt hạt vào khăn giấy ẩm. Lặp lại quá trình bóc vỏ hạt như trên đối với các hạt còn lại. Cho gói khăn giấy vào túi ni lông có khóa kéo và đóng chặt lại. Để túi ni lông ở nơi tối và ấm áp cho đến khi hạt nảy mầm. Đem trồng khi rễ mầm dài ra khoảng 8 cm. Đặt chậu ở nơi ấm áp và có ánh nắng.