– juice from 2 small limes – 1/2 small onion — , roughly chopped (red or yellow) – 1 clove garlic — , quartered – 1/2 jalapeño pepper — , chopped (or more according to taste, optional) – 1/2 tsp salt – 3 medium ripe avocados — , peeled and cut into cubes – 1/4 cup fresh cilantro leaves