Slice nectarines off the pit into medium/large chunks. Dice the red onion.
For a milder salsa, slice the jalapenos, removing the seeds and ribs before dicing. For a spicy salsa leave the seeds and ribs in.
Combine nectarines, onion, jalapenos, and salt in a food processor. Blend until coarse. Taste and add more jalapeno if necessary for your taste.
Add cilantro and lime juice and continue processing until finely minced. Best served the same day.