Q.†Julia Child's recipe for a mixed-starter bread calls for using a small piece of previously made yeast dough. Can this dough have been frozen & thawed?
A.† Almost certainly. Freezing is a good way to keep a starter that isnít seeing active use. You lose a bit of the yeast when you freeze it, but there should be enough life left in it to help raise and flavor your new dough.†
Bernard Clayton, the mystery author of Bernard Claytonís New Complete Book of Breads (Canada, UK), says if your starter doesnít show signs of life after it has thawed, you may need to give it a little boost with some instant-rise yeast.