Peel and remove pit of all 4 avocados.In a medium serving bowl, or Mojacete, mash the avocados, coarsely.
Strip the leaves from the rosemary and mince them, almost to a paste.For the Serrano pepper, remove all membranes and seeds, then chop fine.Mince garlic clove, fine.
Stir with a fork, you are kind of mashing a little more, as you add the rosemary, pepper and garlic.Squeeze in half of lime juice. Add salt and then taste.Adjust seasoning by adding more juice or salt.Serve with chips.