Preheat oil to 400°F in electric fryer or 350°F in propane fryer. Prepare Cornish hens while oil is heating. Remove giblets and rinse Cornish hens with warm water.
Drain cavity completely. While oil is heating, inject Cornish hens using ½ oz of marinade in each breast, ¼ oz into each leg and thigh.
Sprinkle steak and poultry seasoning (your preferred brand) on the outside and inside of Cornish hens.
Place Cornish hens in basket and lower slowly into oil. Maintain temperature at 325°F. Fry for 14 minutes.
Remove basket and place in a pan to drain excess oil.