Sift flour and salt into a _warm_ bowl, make a well in the center and pour in the yeast mixture. Gradually work in the flour from the sides and knead to a smooth dough; cover and leave in a warm place to rise 1-1/2 to 2 hours. Then add sugar and beaten egg and knead thoroughly. Roll out and use as required.
For hamentaschen, roll out the dough to 1/4 inch thick, cut into
4-inch rounds, and brush edges with melted margarine or oil. Spread with
desired filling and fold edges to form three-cornered cakes. Brush the
top with warm honey, [I'd go with egg wash] leave in a warm place to rise
till bulk is doubled, then bake in a moderately hot oven (400 F) till golden
Using this kind of a dough, it could be easy and fun to make some
plate-size ones, particularly if you have some little kids to dazzle.