Dissolve yeast in 1 1/4 cups warm water.
Stir in butter, salt and egg custard mix.
Add flour gradually, blending well.
Turn out on floured board; knead several times.
Roll out; cut into 24 rounds with biscuit cutter.
Fold over as for Parker House rolls.
Place on cookie sheet; cover and let rise until doubled in bulk.
Bake at 400 degrees until golden brown.