Prep: *thaw cornish hens in the fridge or cold water for at least 24 to 48 hours.
Preheat an electric smoker to 350 degrees.
Drain and pat the Cornish hens dry, removing the packs of giblets or neck pieces, then let them rest at room temperature for 30 minutes to an hour.
In a small bowl, combine the salted butter, Jamaican curry seasoning, smoked sea salt, fresh thyme, and marjoram.
Brush the Cornish hens generously on all sides, including the inside of the cavity, with the butter and herb mixture.
Using butcher's twine, tie the legs together on each Cornish hen. Tip: This helps them cook evenly.
Arrange the Cornish hens in aluminum pans and place them on the center rack of the smoker. Then reduce the temperature to 275 degrees and smoke the hens for 3 to 3 1/2 hours, or until an instant-read thermometer reaches 165 degrees.
Remove the hens from the smoker and allow them to rest for ten (10) minutes.