Gruyere Is Great For Grilled Cheese, But Be Aware Of One Downside - Tasting Table
Briefly

Gruyere is a dream choice for grilled cheese because it melts easily, providing that essential cheese-pull, thanks to its high water-to-oil ratio and creamy texture.
While Gruyere is creamy and nutty, its muted sweetness means it should be paired with bolder cheeses for a more complex flavor in a grilled cheese sandwich.
Read at Tasting Table
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