Fill a pot with water and add salt if desired
Bring the water to a boil
Add the frozen shrimp directly to the boiling water
Stir once to separate the shrimp
Boil until the shrimp turn pink and opaque
Cook small shrimp for about 2 to 3 minutes
Cook medium shrimp for about 3 to 4 minutes
Cook large shrimp for about 4 to 5 minutes
Drain the shrimp immediately
Rinse with cold water or place in ice water to stop cooking
Serve or use as desired