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Buttermilk = acid + dairy. Any acid + milk replicates the tenderizing effect.
| Amount needed | Use instead | Notes |
|---|---|---|
| 1 cup | 1 tbsp white vinegar or lemon juice + enough milk to fill 1 cup | Rest 5–10 min until slightly thickened. THE standard swap. |
| 1 cup | 1 cup milk + 1 3/4 tsp cream of tartar | Pantry-stable version. |
| 1 cup | 3/4 cup plain yogurt + 1/4 cup milk | Thicker — good for dressings. |
| 1 cup | 1 cup milk + 1 tsp lemon juice (dairy-free: unsweetened soy) | Soy milk curdles convincingly. |
1 tbsp white vinegar or lemon juice + enough milk to fill 1 cup; 1 cup milk + 1 3/4 tsp cream of tartar; 3/4 cup plain yogurt + 1/4 cup milk.