Milk + Lemon Juice or Vinegar (Best Option)
1 cup milk + 1 tablespoon lemon juice or white vinegarThis substitute works by acidifying the milk, which mimics the lactic acid in buttermilk. The acid reacts with baking soda to produce carbon dioxide, creating lift and a tender crumb in scones. The milk provides the necessary moisture and fat content to maintain texture.
For best results, mix the lemon juice or vinegar into the milk and let it sit for 5-10 minutes before using. This ensures proper curdling and acidity. Use whole milk for richness closer to buttermilk.
Compared to buttermilk, this substitute produces very similar results in texture and flavor, with only a slight difference in tanginess depending on the acid used.