Frozen shrimp is your ticket to making this delicious curry for a weeknight dinner. You'll need to thaw the shrimp first, but that can be done in relatively short order. Here the shrimp is cooked in a heady mixture of onion, tomatoes, and coconut milk that's seasoned with curry powder. It's important to the flavor of the dish that the curry spices are "toasted" once added to the onion to bring out their aromatic oils, stirring constantly to cook them evenly.