Roast the ingredients until they start showing some blistering and look slightly softened, turning them to make sure they roast evenly. The garlic cooks in a few minutes and you will need to remove it, peel the skin, and set aside. The roasting process will take about 8 minutes. If your tomatoes don’t look to softened, wrap them in aluminum foil for about 10 minutes, this will help them to finish cooking.
Have sterilized pint jars and lids and screw caps ready (they should all be washed in very hot water). Use a canning funnel and ladle hot salsa into jars, leaving a ½-inch head space. Wipe rims clean with a damp cloth and carefully place lid on and screw cap in place.  Process in a boiling water bath for 15 minutes, then place upright on counter for 24 hours (see recipe notes for link to USDA Canning Guidelines). You will hear popping sounds as the jars seal. If after 24 hours, any haven't sealed, put in refrigerator to use now.
The salsa will have a more desirable consistency if skins, seeds and cores are removed prior to processing. Skins can be easily removed by blanching the tomatoes. To blanch, place batches of tomatoes in boiling water for about 30 seconds. Immediately submerge the boiled tomatoes in a bowl of ice water. The skins will easily peel off, and the peeled tomatoes can be sliced, cored and seeded, chopped, then drained of excess water.
Preheat the broiler. Put the quartered tomatoes, sliced onion, and whole garlic cloves onto a roasting tray, spreading out evenly. Drizzle with plenty of olive oil and season well with salt and pepper and sprinkle with cilantro sprigs. Broil until everything is nicely charred, about 10 minutes (you want lots of deep rich color so don't be afraid if some of the edges get pretty black).
Absolutely love this. You were right. Getting as much water out is so really important step. I drained as best I could with colanders then put in glass bowl. More liquid settled so I used a turkey baster to remove more liquid. Won’t ever make it another way. I have been looking for a salsa that has body and flavor and this is outstanding. I made my own tomato sauce as the tomatoes I got from local farmer were meaty and very flavorful. Thank you for posting this outstanding salsa recipe. 
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