The rosemary steeps in boiling water; be sure to let it cool to 100° to 110° before adding the yeast so your dough will rise correctly. Sea salt and kosher salt have larger crystals than regular salt, so either adds a nice crunch to the top of the focaccia bread. But be sure to use regular salt in the dough for best results. You don't need to use all of the egg and oil mixture on top of the dough; spread enough to coat the top, and discard any extra. Use remaining bread for sandwiches, or cut into 1/2-inch cubes and bake at 350° for 15 minutes (or until toasted) to make croutons for salads.