It was unusual when I discovered that we had absolutely no salsa in our house and we were having Mexican food, so I hurried and threw some ingredients into the food processor and was so happy with the results. All of these measurements are approximate since I didn't measure anything when I made it.
It is wonderful not to chop anything up, just throw it in and let those blades do the hard work!
Add all ingredients to a food processor or blender:
1 large can stewed tomatoes
1/4 of a small onion
Cilantro to taste
1 tsp chili powder
1/2 tsp red pepper flakes
Blend until desired texture and taste with a chip and decide if it is your desired spiciness. We don't like spicy, so this is not a spicy salsa. Serve with your favorite tortilla chips.