Drop the shrimp into the simmering liquid. Give the shrimp a stir and let them sit in the hot liquid for about 3 minutes or until the water comes back to a boil. They should turn bright pink and feel firm if squeezed. Drain the shrimp and transfer the shrimp to an ice bath to cool for a few minutes. Remove from the ice bath and dry well. You can do this step a day ahead of time if desired.