Put the flour in a bowl, mix if necessary and make a larger hollow in the middle. Warm up the milk a little, dissolve the yeast, salt and sugar in it. Then stir in the oil and pour the mixture into the well. Let this pre-dough stand for 15 minutes, then knead everything into a smooth dough. Dust the dough with a little flour and let rise covered for 1 hour.
When the dough has twice its volume, form six to eight balls out of it. Drill holes in the center with your thumb or the handle of a wooden spoon and use your hands to widen the holes (to about 3 cm in diameter) to form rings.
Bring the water to a boil in a pan or a large saucepan and add the baking soda - but be careful, it foams a lot, so keep the water just below the boiling point as possible.
Put the rings in the water, turn after a minute and simmer for another 30 seconds. Carefully remove from the water, preferably with a slotted spoon and place on a baking sheet lined with baking paper or greased. Bake in the oven at 200 ° C (top / bottom heat) for 20-25 minutes.
I especially like the avocado cream (mash ripe avocado with a chopped tomato, a teaspoon of vinegar, pepper and salt. Even finer: add 1 finely chopped, boiled egg).