Peel and devein shrimp if needed. Tails on or off is your decision. I take them off to make eating easier.
Sprinkle the shrimp evenly with salt and set aside.
Add the chiles to a small pot and add enough water so they are just covered. Bring water to a boil. Lower the heat and cover. Simmer for about 20 minutes or until softened.
Drain cooked pods and discard the water which can be bitter.
Puree softened chiles with ½ cup fresh water, garlic, and tomato, in a blender until smooth and set aside.
Heat a large, deep skillet over medium heat and add olive oil to the pan.
Add shrimp to the pan, and cook for about a minute per side. Once the shrimp turns pink, it is cooked so be careful not to overcook.
Add the chile sauce slowly. Simmer on medium heat for 3-4 minutes to heat through and meld the flavors together.