Stir through 1 tbs of either lemon juice or white vinegar.
Leave for 5 minutes.Note: the milk will become slightly curdled.
Use the buttermilk in your favourite recipes!
Notes
RECIPE NOTES & TIPS
I recommend using full-cream milk for best results, although you can use any type of milk really, even dairy-free milks such as nut milk, soy or vegan milk, if you prefer.
Use any clear, or almost clear vinegar, such as regular white vinegar, white wine vinegar or apple cider vinegar.
If you use lemon juice, either freshly squeezed or store bought lemon juice work equally well.
Allow the buttermilk to sit at room temperature for at least 5 minutes, and up to 10 minutes, for the acidity to form.
Storage - you can store homemade buttermilk in a sealed glass container in the fridge for up to 14 days.
Freeze buttermilk in a sealed container for up to 3 months. The texture will be a little grainy when thawed, but it is still perfectly suitable to use in your baking.