Add all ingredients to a food processor or blender and pulse until mostly smooth.
Notes
Makes about 1 1/2 cups pesto.When measuring the cilantro, there's no need to remove the leaves from the stems. Simply remove and discard any extra long stems, and then loosely pack the cilantro into a measuring cup.Don't have cotija cheese? Use crumbled feta or shredded parmesan cheese instead. They both have a similar flavor and the perfect amount of saltiness like cotija cheese!Instead of sliced almonds, you can use pine nuts. Or if you have whole almonds, just give them a quick chop before measuring them out.Don't have red onions? Use white onions instead, or you can completely leave them out. The pesto will still be delicious.