Preheat grill to high (or preheat broiler).Advertisement
Grill tomatoes and jalapeño, turning frequently, until charred, 10 minutes for the tomatoes, about 5 minutes for the jalapeno. (To broil, place on a baking sheet and broil about 4 inches from the heat, turning once or twice, until charred, 8 to 10 minutes total.)
When cool enough to handle, core the tomatoes and remove the stem from the jalapeño. Place in a food processor along with garlic; pulse to form a chunky mixture. Season with salt to taste.
Canned-Tomato Variation: No fresh tomatoes? Drain two 14-ounce cans of fire-roasted tomatoes. Roast jalapeño in a small dry skillet over medium heat, turning occasionally, until soft and blackened in spots, 10 to 15 minutes. Pulse the drained tomatoes, jalapeño and garlic in a food processor until chunky.
Make Ahead Tip: Cover and refrigerate for up to 5 days or freeze for up to 3 months.
Cut Down on Dishes: A rimmed baking sheet is great for everything from roasting to catching accidental drips and spills. For effortless cleanup and to keep your baking sheets in tip-top shape, line them with a layer of foil before each use.