Camp Shrimp

1 pound large shell-on shrimp
3/4 cup liquid margarine or butter
Cajun spice
Red pepper
Salt
Black pepper
Granulated chopped garlic, to taste
1 slice onion
Tabasco sauce, to taste
Slice lemon

Put all ingredients into a cast iron skillet. Cover and bring butter to boil. Serve in skillet with French bread or rolls.