What ingredient is not part of the recipe for the coastal key lime margarita on the rocks?

The coastal key lime margarita on the rocks does not include grenadine in its recipe. This cocktail is designed to highlight the tartness and brightness of key lime flavors, which are best complemented by ingredients that enhance its citrusy profile. Blue chair bay key lime rum, Minute Maid lemonade, and pineapple juice all serve to create the refreshing and tangy essence of this margarita, balancing sweetness with the key lime's unique tartness.

Grenadine, on the other hand, is a sweet and often brightly colored syrup made from pomegranate juice. Its addition would alter the drink's intended taste and coloration, steering it away from the signature key lime flavor profile. This makes it an unsuitable ingredient for a margarita focusing on coastal key lime flavors, as it would introduce unnecessary sweetness and change the drink’s overall style.