9 Buttermilk Recipes From 7 Cuisines.
Thin, tangy and acidic, which is what makes it useful. Its acid reacts with baking soda to lift soda bread, biscuits and pancakes, and it tenderises chicken in a marinade better than plain milk because the acidity works slowly without turning the surface mushy. In India it is thinned and salted into a cooling drink; in the Netherlands and Scandinavia it is drunk plain. If you have none, soured milk works, though the texture is looser and the lift weaker.
9 recipes on this route
The recipes.

Denmark1 hr 15 min
Æbleskiver
Danish Spherical Pancake Puffs
United States45 min
Biscuits and Gravy
Buttermilk Scones in Sausage Cream Gravy

Ireland55 min
Boxty
Raw and Mashed Potato Pancake

Ireland1 hr 15 min
Irish Soda Bread
Buttermilk Quick Bread
Saudi Arabia2 hr 10 min
Jareesh
Crushed Wheat and Lamb Porridge

Estonia16 min
Kama
Estonian Toasted Grain Flour with Kefir

Norway1 hr 5 min
Norske Vafler
Heart-Shaped Cardamom Waffles

Iceland20 hr 15 min
Rúgbrauð
Icelandic Steamed Dark Rye Bread
United States35 min
Skillet Cornbread
Unsweetened Southern Cast-Iron Bread
also known ascultured buttermilk, chaas, karnemelk