What is the best ingredient to use as a substitute for buttermilk in recipe?

The best buttermilk substitute depends on what you're making, but here are a few popular options:

For baking:

* Milk + Lemon Juice/Vinegar: The most common and versatile substitute. Mix 1 tablespoon of lemon juice or vinegar with 1 cup of milk. Let it sit for 5-10 minutes, and the acid will curdle the milk, creating a buttermilk-like consistency.

* Plain Yogurt: This is a great alternative if you have some in your fridge. Use 1 cup of plain yogurt for every cup of buttermilk called for in the recipe.

* Sour Cream: This works well in recipes that call for a tangy flavor, but it can be a little heavy. Use 1 cup of sour cream for every cup of buttermilk called for.

* Buttermilk Powder: This is a pre-made mix that you just add water to. It's a good option if you need a true buttermilk flavor.

For cooking:

* Sour Cream: Works well in savory dishes that call for a tangy flavor.

* Yogurt: You can use plain yogurt in savory dishes, but be aware that it can be a bit thin.

Important Considerations:

* Acidity: Buttermilk has a distinct tanginess that comes from its lactic acid content. Some recipes may require this acidity for proper texture and flavor.

* Fat Content: Buttermilk is typically higher in fat than regular milk. If you use a low-fat substitute, your final product may be less rich.

* Recipe: Some recipes may specify a certain type of milk or yogurt, so it's always best to check the recipe instructions first.

Pro tip: If you're unsure, start with a smaller amount of your chosen substitute and adjust as needed. You can always add more to achieve the desired consistency and taste.