Goan Shrimp in Roasted-Coconut Sauce Recipe

Ingredients

• 1 teaspoon coriander seeds
• 1/2 teaspoon cumin seeds
• 1 (1-inch) piece cinnamon stick, broken into pieces
• 4 whole cloves
• 1/4 cup unsweetened dried grated coconut
• 1 teaspoon hot red-pepper flakes
• 1/2 teaspoon turmeric
• 3 tablespoons vegetable oil
• 1 medium onion, finely chopped
• 3 garlic cloves, finely chopped
• 1 tablespoon grated peeled ginger (use a Microplane)
• 2 (4-inch) fresh hot green chiles, cut lengthwise into thin shreds, plus seeds
• 1/4 cup Swad-brand tamarind concentrate (see cooks' note, below)
• 1 cup finely chopped plum tomato (1 large)
• 1 1/2 lb large shrimp, peeled
• 1 teaspoon coarse sea salt such as fleur de sel
• 2 teaspoons Sherry vinegar or red-wine vinegar
• Equipment: an electric coffee/spice grinder
• Accompaniment: basmati rice or Indian bread