In a medium saucepan, melt 1/2 cup of unsalted butter over medium heat, stirring gently. Add 4 cloves of finely chopped fresh garlic and sauté until fragrant and lightly golden. Set aside.

Place 1 pound of large, peeled, and deveined shrimp in a mixing bowl. Sprinkle with 2 tablespoons of Cajun seasoning and toss until evenly coated. Let rest for 10 minutes.

Preheat the grill to medium-high. Thread the shrimp onto the skewers, leaving space between each for even cooking.

Grill the shrimp skewers for 2-3 minutes per side until they turn pink and opaque.

Brush the grilled shrimp with the prepared garlic butter and squeeze fresh lemon juice over them.

In a medium bowl, mash 1 ripe avocado until smooth. Mix in 1/4 cup of chopped cilantro, lime juice, and salt to taste until well combined.

Serve warm with the creamy cilantro lime avocado sauce and garnish with lime wedges if desired.