a. Place buttermilk and sliced onions in a medium bowl to soak for about 15 minutes.
b. In another medium bowl, mix together flour and cornstarch.
c. After onions have soaked, dredge them in flour/cornstarch mixture.
d. In a small saute pan over medium high heat warm enough cooking oil to submerge
e. Fry onions until golden brown and crispy.
f. Drain on wire rack or paper towel and set aside.