Roast jalapenos in oven under broiler.

Place roasted jalapenos in ziplock bag and zip shut to steam for 10 minutes.

Using gloves, remove skins from jalapenos under running water. Remove the seeds too. If you like really hot salsa, leave the seeds in one jalapeno.

Transfer the jalapenos to the food processor and add garlic cloves. Pulse the jalapenos, scrape sides with a spatula, and pulse again.

Add the can of tomato sauce to the jalapenos. Hit pulse, scrape down the sides, and pulse again.

Transfer the jalapeno mixture to a bowl.

Add roughly chopped onion, tomatoes and cilantro to the food processor. Pulse, scrape down the sides and then pulse again.

Transfer onion mixture to the bowl with jalapeno mixture and stir to combine.

Taste for salt.