Using an immersion blender or food processor, carefully purée the salsa to a smoother consistency. In a food processor and working in batches, pulse 8 - 10 times and when all finished, return to the pot. Taste for seasonings and if too vinegary, add another tablespoon or so of sugar. If too sweet, add a little more vinegar to balance. Bring blended salsa back to a boil and simmer a few more minutes.
This recipe is great as long as you don’t use all of the cooking water when adding the vegetables to the blender. If you do, you’ll end up with the runny, watery “soup” that commenters above complained about. Spoon the boiled vegetables into the blender, then add the water from the pan *as needed* to liquify the ingredients. You need maybe half the amount of water that you boiled the ingredients with. And if it’s still too watery, simmer it for longer during the final stage until the consistency is right. I think the recipe should be re-worded a little to reflect this issue.
As you will notice when we dive a little further into these recipes, Mexican food has a stunning range of somewhat special ingredients. From Masa Harina, the essential ingredient of corn over a wide array of chilies either fresh, dried or ground to Mexican oregano and tomatillos. Some of these may at first glance seem foreign and difficult to come by, but fear not we’ll discuss the individual ingredients as we go and they’ll be easier to come by than you think.