El Castillo Mexican Bar and Grill benefits from a waterfront or coastal backdrop in Edinburgh, United Kingdom, which gives the meal a clearer sense of occasion before the food arrives. Readers should look for the quality of the grill, the meat program and the wine or cocktail support around it, because that is where a restaurant of this type earns its reputation. Read it as a place for a polished meat-led night with enough wine-and-cocktail support to make it feel complete, with the final judgment depending on execution, hospitality and consistency across the meal.