Mix together the pepper, cajun seasoning, garlic, salt, thyme, olive oil and worcestershire sauce. Set aside.
Preheat large cast iron pan on medium/high heat for 30-60 seconds.
Place shrimp in an even layer in the pan.
Pour spice mixture over the shrimp.
Cook for 3-4 minutes (depending on size) until the shrimp turn pink and begin to curl.
Reduce heat to medium.
Add the lemon wedges while squeezing slightly.
Begin adding the butter cubes 3-4 at a time.
Once the butter is melted, remove from heat.
Serve immediately with a crusty bread loaf.