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1
Cut a lengthwise slit in each chile; discard seeds and stems. Combine chiles and boiling water. Cover and let stand 10 minutes. Drain chiles through a fine sieve over a bowl, reserving 1/2 cup soaking liquid. Place chiles, onion, and next 9 ingredients (onion through garlic) in a food processor; process until smooth. Combine chile mixture and reserved soaking liquid in a small saucepan. Bring to a boil; reduce heat, and simmer 15 minutes.
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2
Spoon yogurt onto several layers of heavy-duty paper towels; spread to 1/2-inch thickness. Cover with additional paper towels; let stand 5 minutes. Scrape into a bowl using a rubber spatula. Add juice, 1/4 teaspoon salt, and saffron; stir well. Cover and refrigerate.
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3
Place tomatoes in a nonstick skillet over medium-high heat. Saute 10 minutes or until lightly browned, and cool. Cut a slit in each tomato; mash gently. Discard seeds.
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4
Preheat broiler. Peel shrimp, leaving the tails intact. Starting at tail end, butterfly each shrimp, cutting to, but not through, underside of shrimp. Brush shrimp with about 1/2 cup chile mixture; arrange shrimp on a broilerpan coated with cooking spray. Broil 6 minutes or until shrimp are done.
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5
Place 1/2 cup yogurt mixture in a small heavy-duty zip-top plastic bag, and seal. Snip a tiny hole in 1 corner of bag; drizzle yogurt mixture over each of 6 plates. Arrange 1/3 cup watercress evenly over yogurt. Top with 3 shrimp and 4 tomatoes. Sprinkle with cilantro and chili powder.
