Peel shrimp and cut chicken into 1" cubes. Combine garlic, onion
powder, cumin, and melted butter. Marinate shrimp and chicken while
preparing grill. String shrimp and chicken onto separate skewers.
Cook about 5" above hot coals, allowing 5 minutes for shrimp and 10
minutes for chicken. Turn once or twice while cooking and baste often
with remaining marinade.