2tablespoonsvinegar,white distilled vinegar or lemon juice
Instructions
Mix vinegar into milk and let it sit for 5-10 minutes, I do find 10 minutes does quite better.
It will curdle a little bit, that is the vinegar doing its magic on the milk.
The result will be tangy-tasting milk, just like buttermilk.
I've been adding more vinegar than 1 tablespoon and it's been great, and if the milk is at room temperature or heated in the microwave for 15 seconds it's thicker. Great for a real substitute in recipes.
Notes
You can use less vinegar, but I find these portions work the best.