heat Oven to 350 degrees F.
Mix flour, baking powder, pumpkin pie spice, baking soda, salt and cloves in bowl, set aside.
beat shortening in a large bowl with electric mixer on medium speed for 30 seconds or until creamy. Add brown sugar and molasses; beat on medium speed until blended. Add eggs, one at a time, beating well after each addition. stir milk, pumpkin and ginger in small bowl. Add dry ingredients and pumpkin mixture alternately to beaten mixture, beating on low speed after each addition until combined. spoon batter into 3 greased and floured 8 or 9 inch round cake pans. Bake 22 to 28 minutes or until tooth-pick inserted in center comes out clean. cool 10 minutes in pans on wire racks; remove cakes from pans. cool completely on wire racks. beat cream chese , butter and vanilla in large bowl on medium speed until smooth. gradually add 4 cups of the powdered sugar and lemon juice, beating until] combined. beat in remaining powdered sugar until combined. if necessary, beat in additional powered sugar or lemon juice to make frosting of spreading consistency. split each cake layer in half horizontally. spread frosting between cake layers and on top of cake. top with finely shredded orange peel, if desired.
Source: Diana Baker Woodall