In a saucepan, combine the tomatillos and jalapenos. Cover with water and bring to a boil.
Once boiling, reduce heat and simmer for about 10 minutes, or until the tomatillos are soft but not falling apart.
Drain the water and transfer the tomatillos and jalapenos to a blender.
Add the garlic, cilantro, onion, salt, and lime juice to the blender.
Blend until you reach a smooth consistency, adjusting seasoning with more salt or lime juice if necessary.
Transfer the salsa to a bowl, cover, and refrigerate until ready to serve.