Heat oil in a 12” skillet over medium-high heat, cook garlic until lightly brown, 3 minutes. Be carful not to burn the garlic!
Add onion and cook 3-4 minutes, Add chiles and cook 1-2 minutes.
Add tomatoes and 1⁄4 cup water and cook until tomatoes begin to break down, about 8-10 minutes.
Place in a blender with salt and 10 tbsp. water, purée until smooth.
Place salsa into an air tight container