Answer:
I'm a ring of sliced onion dipped in batter and then deep fried.
What starts with an "e" but only has a single letter in it?
What is an acceptable act of violence during saint Patrick's day?
Blind but cruel.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
I'm a soft, sweet food made from a mixture of flour, shortening, eggs, sugar, and other ingredients, baked and often decorated.