Milk + Lemon Juice or Vinegar (Best Option)
1 cup milk + 1 tablespoon lemon juice or white vinegarButtermilk is acidic, which helps tenderize proteins in meat and activates baking soda or other leavening agents to create a light texture. Adding lemon juice or vinegar to milk replicates this acidity, ensuring similar chemical reactions occur in the meatball mixture.
To use, combine the milk and acid and let it sit for 5-10 minutes until it curdles slightly. Use immediately to maintain the acid's effectiveness. Avoid using ultra-low-fat milk as it may not provide enough moisture.
The final meatballs will have a tender, moist texture very close to those made with buttermilk, with a subtle tang that enhances flavor without overpowering the dish.