Paczki (Polish Doughnuts)

Heat cream to lukewarm. Add salt and egg yolks and beat until thick. Cream butter and sugar. Put these into large bowl, add yeast dissolved with 1 Tbs. sugar and mix thoroughly. Add rum then flour and cream alternately and beat hard till dough blisters. Set in warm place to rise. Punch down and let rise again. Place dough on floured surface and stretch and fill with pitted prunes. Fold over and cut into desired size balls. Place on floured surface and let rise. Fry in deep hot oil turning once. Paczki should be a very dark color before turning to ensure that they are thoroughly baked. Drain on soft absorbent paper. Sprinkle with powdered sugar.