Remove tops and seeds from the spicy chili peppers. Put seeds aside. You may want to wear gloves to prevent burns on your skin from capsaicin. Put the peppers in a blender. Add seeds to taste, if you want it real spicy add more than 20, if you want it moderate don't add any. Squeeze fresh lemon and add to blender. Add Cilantro to the blender, Add salt to the blender. Blend. Remove.
Initially, this sauce is quite spicy. If jalapenios are a 2 -3 on a scale of 1 -10 this can be a 6. As there are no preservatives this sauce can last for ten days in the refrigerator.