Milk (Best Option)
1:1 (replace 1 cup beef broth with 1 cup milk)Milk works well as a substitute because it provides both moisture and fat, which are critical for the structure and tenderness of pound cake. The proteins and sugars in milk also contribute to Maillard browning, improving crust color and flavor.
For best results, use whole milk to maintain richness. Be mindful that milk slightly sweetens the batter, which complements the cake's flavor. Avoid overheating milk before mixing to prevent curdling.
Compared to beef broth, milk maintains the cake’s expected texture and sweetness without introducing savory or off-flavors, resulting in a classic pound cake experience.