Once you have a roasted turkey breast on hand, you will be astonished at the number of ways you will find to use it. This is just one very simple example. The capers in the pesto make a sizable contribution. If you don't have parsley pesto, stir capers into a flavored mayonnaise. Or use olive paste or plain pesto. The point is to use the spread, whatever it might be, to provide a burst of big flavor for the turkey and bread. Pane rustico is a crusty rustic bread traditionally baked in a wood-fired oven. Look for it in specialty markets.