A great, fast recipe for pre-cooked shrimp from http://www.cooks.com.  The carb count is unknown but, based on the ingredients, is very low.

INGREDIENTS:

• 1 lb. medium shrimp, pre-cooked, frozen
• 3 tablespoons butter
• 1/2 teaspoon (or more to taste) Old Bay seasoning
• 1 tablespoon fresh parsley, chopped (optional)
• 1 teaspoon chopped garlic or 1/4 teaspoon garlic powder
• 1 teaspoon Frank’s Hot Sauce
• 1 teaspoon fresh lemon juice (optional)

INSTRUCTIONS:

1. Do not thaw shrimp.  Place shrimp in a microwave-proof bowl (if using fresh garlic, add now) and microwave on high setting for 2-3 minutes or until shrimp are steaming hot.  Drain liquid.
2. While shrimp are hot, add butter, hot sauce, (lemon and parsley), if using, and remaining seasonings.  Return to microwave for 10 seconds, or until butter has melted.