Buttermilk (Best Option)
1:1 (1 cup buttermilk per 1 cup whole milk)Buttermilk closely mimics whole milk's moisture and fat content but adds acidity, which can help tenderize the meat slightly and enhance flavor complexity. The lactic acid in buttermilk breaks down proteins, improving juiciness and softness.
For best results, use fresh buttermilk and avoid overmixing the burger mixture to maintain texture. The acidity also helps bind the meat better, reducing crumbling during cooking.
Compared to whole milk, buttermilk yields a slightly tangier burger with improved tenderness and moisture retention, making it an excellent choice for juicy, flavorful patties.