Homemade salsa picante can dress up tacos or serve as a table sauce for chips.
Preheat broiler. Place tomatoes, jalapenos, onion, and garlic on a rimmed baking sheet. Broil, turning vegetables often and rotating baking sheet frequently, until tomatoes are blistered with dark spots and flesh is tender, about 5 minutes. Let cool. When vegetables are cool enough to handle, peel garlic. Puree garlic, tomatoes, jalapenos, onion, water, vinegar, and salt in a blender until almost smooth. Serve warm or chilled. Sauce can be refrigerated for up to 3 days.