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Preheat oven to 350F. Grease a
deep 12-inch oven-going skillet; set aside.
Separate egg whites from yolks. Place whites in
a large mixing bowl; cover and let stand for 30
minutes.
-
Meanwhile, in a very large bowl
beat egg yolks with an electric mixer on medium
to high speed for 4 to 5 minutes or until thick
and lemon-colored.
-
Add 1/4 cup of the granulated
sugar. Beat until combined. Add ricotta cheese
and flour, beating on low speed just until
combined; set aside.
-
Wash beaters thoroughly. Beat egg
whites with the electric mixer on medium speed
until soft peaks form (tips curl over).
Gradually add remaining 1/4 cup granulated
sugar, 1 tablespoon at a time, beating on high
speed until stiff peaks form (tips stand
straight).
-
Fold half of the beaten egg
whites, the chocolate piece , and orange peel
into the egg yolk mixture. Fold in remaining egg
whites.
-
Turn mixture into prepared
skillet. Bake about 40 minutes or until set, top
is lightly browned, and a knife inserted near
the center comes out clean.
-
Cool in skillet on a wire rack
for 30 minutes. Serve warm. If desired, sprinkle
with powdered sugar before serving.