Melt the butter in a pan. Add sugar; heat until well blended.
Dissolve soda in milk; add gradually to sugar mixture. Stir until
well blended and set aside to cool. Beat eggs lightly. Add salt and
cooled milk-and-sugar mixture. Put bread cubes into greased baking
dish; pour custard over. Bake in preheated 350F oven about 45
minutes. Serve with vanilla ice-cream.