In a large skillet, melt butter over medium heat.
Add shallots and cook until softened, about 2 minutes.
Add garlic and cook until fragrant, about 30 seconds.
Stir in tomato paste and Cajun seasoning, cooking for 1 minute.
Slowly whisk in chicken broth, then heavy cream.
Add uncooked shrimp
Bring to a simmer and cook until thickened, about 5-7 minutes.
Stir in Worcestershire sauce, hot sauce, salt, and pepper.
Remove from heat and stir in parsley and green onions.
Serve over shrimp and grits, pasta, or rice.