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Export 7 ingredients for grocery delivery
Step 1
Position a wire rack on the top level of the oven, about 6 inches from the broiler. Preheat broiler on high.
Step 2
On a cookie sheet, place onion slices and tomatoes cut side down. Roast until a bit charred on the edges, about 10 minutes.
Step 3
Over medium heat, sauté garlic in 1 tablespoon of vegetable, turning several times with tongs, about 1 minute. Add chiles to garlic, sauté for 1-2 minutes, flipping occasionally until they just start to toast. Take care not to burn.
Step 4
Transfer chiles and garlic to a high-speed blender. Pour in the water and vinegar, and let stand for 5 minutes to soften.
Step 5
Purée on high, 10 to 20 seconds. Turn to low speed and slowly add remaining vegetable oil in a slow and steady stream so the oil mixture will emulsify, creating desired creamy consistency.
Step 6
Add the tomatoes, onion and salt. Purée on high, until smooth.
Step 7
Serve now or store in the fridge for about 2 weeks. Enjoy!