Frank Sinatra's Eggplant Parmigiana

1/4 cup all-purpose flour
1/2 teaspoon salt
1 medium eggplant, peeled and cut crosswise in 12-inch slices
1 egg, beaten
1/4 cup vegetable oil
1/2 cup (1 1/2 ounce) grated Parmesan cheese
6 ounces mozzarella cheese
Tomato Sauce (recipe follows)

Prepare Tomato Sauce and set aside.

Combine flour and salt. Dip eggplant in egg, then in seasoned flour. Saut