Adapted from Recipe of Memory.The original recipe used 1 1/2 lbs of pork spare ribs(therefore the costillitas in the title) and 4 California chiles+2 guajillo chiles.I could not find California chiles in my area ,and I just happen to really like pork necks,so they made it into my version.Without reducing the amount of ribs this made for a meatier soup.This is a really simple recipe you could easily play with it using any type of meat or greens you like.BTW because this relies on fairly mild chiles it's not spicy even though it has good chile flavorTthough good on it's own,and not part of the original recipe,this is really good with a little lime juice,cilantro,and chopped onion ala menudo..