Combine flour, baking powder, salt, and ground ginger in small bowl and mix well. Set aside.
Zest lemon over 3/4 cup sugar so that sugar can absorb all of the oils from the zest. Gently stir.
Using electric mixer, beat 6 tablespoon of butter until fluffy. Add sugar-lemon zest mixture and beat well. Add eggs to creamed mixture one at a time, beating after each. Beat in lemon juice and vanilla extract.
Add flour mixture to batter and beat until combined.
Spread about 1 3/4 cups batter in bottom of pan and spread in even layer with offset spatula. (it should be about 1/2--3/4 inch thick.)
Distribute pear pieces over batter evenly. Place raspberries among pears.
Drop remaining batter onto top of pears and raspberries by teaspoonfuls, realizing that there will be a little space between each. The batter will spread as the cake bakes.
Bake for 40 minutes, rotating pan after 20 minutes. Baked cake should be golden brown on top and have a toothpick come out clean when inserted into center.
Cool completely on rack.
Lift out of pan and transfer to plate to serve.