Grilled Garlic Cajun Shrimp Skewers

unsalted butter

garlic (pressed or minced)

cajun spice (provides light heat; it's not too spicy)

salt (omit if using salted butter)

lemon juice (from 1/2 medium lemon)

lbs uncooked large shrimp (21-25 count, peeled and deveined)

medium wooden skewers