Step 1

Mix vinegar into milk and let it sit for 5-10 minutes, I do find 10 minutes does quite better.

Step 2

It will curdle a little bit, that is the vinegar doing its magic on the milk.

Step 3

The result will be tangy-tasting milk, just like buttermilk.

Step 4

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.