Plantain Tamales in Spicy Shrimp Sauce

Ingredients

• 2 lb. large shrimp, peeled and deveined
• Salt
• 1⁄3 cup annatto-infused oil
• 8-10 cloves garlic, peeled and finely chopped
• 1 large yellow onion, peeled and finely chopped
• 8 scallions, trimmed, white and pale green parts only, finely chopped
• 2 bunches chives, finely chopped
• 1 cup tomato sauce
• 2 (14-oz.) cans unsweetened coconut milk
• 1⁄4 bunch cilantro, chopped
• Leaves from 5 sprigs oregano, chopped
• 1⁄2-1 tsp. cayenne
• 6 plantain tamales, cut into 1" pieces
• Freshly ground pepper
• 1 recipe pumpkin rice