Serves 6 generously
6 garlic cloves, unpeeled
1 small white onion, sliced 1/4-inch thick
6 ounces (1 medium-small or 2 to 3 plum) ripe tomatoes
3/4 teaspoon black pepper, preferably freshly ground
1/8 teaspoon cloves, preferably freshly ground
2 tablespoons olive oil
2 to 4 tablespoons very finely chopped canned chipotle chiles, drained before chopping
Salt, about 1/2 teaspoon
2 pounds (about 50) medium-large shrimp
1. Roasting the flavorings. On an ungreased griddle or heavy skillet set over medium, roast the garlic cloves, turning occasionally, until soft (they will blacken in spots), about 15 minutes. Cool and peel. While the garlic is roasting, lay the onion out on a small square of foil, set on the griddle and let sear, brown and soften, about 5 minutes per side. Roast the tomatoes on a baking sheet set 4 inches below a very hot broiler until blackened in spots and soft, about 6 minutes; flip and roast the other side. Cool and peel, collecting all the juices with the tomatoes.
2. The sauce. Combine all the roasted ingredients in a food processor or blender, along with the pepper, cloves and 1/4 cup water. Process to a medium-smooth puree. In a very large (12-inch) skillet, heat the oil over medium-high. When hot enough to make a drop of the puree sizzle noisily, add it all at once. Stir for several minutes as the mixture sears and darkens, then reduce the heat to medium-low and continue to cook, stirring regularly, until very thick, about 5 minutes. A tablespoon at a time, stir in the chopped chipotles, tasting until the thick salsa suits your own penchant for spiciness. (I think these are best when theyve reached the upper levels of heat.) Taste, season with salt and remove from the heat.
3. The shrimp. Peel the shrimp, leaving the final joint and the tail intact. One at a time, devein the shrimp by laying them flat on your work surface and making a shallow incision down the back, exposing the (usually) dark intestinal track and scraping it out
Return the skillet with the sauce to medium-high heat. Add the shrimp, then slowly stir and turn for about 3 to 4 minutes, until the shrimp are just cooked through. (The sauce should nicely coat the shrimp, though it wont really pool around them.) Taste a shrimp, sprinkle on a little more salt if necessary, then pile up the crustaceans on a rustic platter and carry them to the table.

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