Vegetables may as well have feelings. Many vegetable demonstrates observable reactions to cuts. If you can switch the angle of perspective to plants like Sri Nisargadatta Maharaj do you might as well experience pains as plants were cut and eaten.

The core of any sin is against the will i.e. I have heard there were people who would like to be eaten and found a guy who actually ate him.

In the book I AM THAT Sri Nisargadatta said to a questioner:”

Look, my thumb touches my forefinger. Both touch and are touched. When my attention; is on the thumb, the thumb is the feeler and the forefinger -- the self. Shift the focus of attention and the relationship is reversed. I find that somehow, by shifting the focus of attention, I become the very thing I look at and experience the kind of consciousness it has; I become the inner witness of the thing. I call this capacity of entering other focal points of consciousness -- love; you may give it any name you like. Love says: 'I am everything'. Wisdom says: 'I am nothing' Between the two my life flows. Since at any point of time and space I can be both the subject and the object of experience, I express it by saying that I am both, and neither, and beyond both.