Grease and coat a 6" round baking dish with flour. Preheat oven to 425 degrees.
Mix milk and vinegar in a cup and allow to sit at room temperature for 10 minutes. It will thicken slightly and take on a slightly curdled appearance.
Mix flour, salt and baking soda in a bowl. Stir in the milk mixture. It will be a shaggy dough.
Use your hands to turn the dough into a ball. Dough will still be shaggy but no noticeable dry flour. Shape into a disc shape.
Transfer disc to your baking dish. Score a deep X in the crown of the dough disc. Bake 25 minutes covered. Remove cover and bake a further 10 minutes.
Allow to cool. Slice and serve.
Note: This recipe makes a small loaf. To double for a more traditional size loaf, double the ingredients and prepare an 8" round oven dish. Bake 25-30 minutes covered and 10 minutes more uncovered.