Add the salt and yeast to the flour and stir with one hand and then mix with the lukewarm water. OR Mix lukewarm water and yeast in a small bowl. Let stand until yeast softens and begins to bubble slightly about 5 minutes.
Sift flour and salt together in a large bowl.
Pour water over flour mixture, butter your hands and knead until the dough is smooth and elastic 5 to 7 minutes. If there are pieces of butter on your hands, just knead it in. Cover the bowl with a clean cloth, and let the dough rise in a warm corner until doubled in volume, about 45 minutes, make sure it has doubled enough in volume.
Heat oil in a deep-fryer or large saucepan to 350 degrees F (175 degrees C).
When the dough is ready, knead it again, buttering your hands again, break a piece off, make a ball according to the size you want and quickly flatten. Fry flattened pieces of dough in the hot oil, 2 to 3 pieces at a time, until golden brown, about 3 minutes per side. When it feels light, you will know it is cooked.