I have a co-worker who I get along with just fine except for one thing. She keeps asking if she can have a taste of whatever I am having for lunch “because it looks so good”. This happens whether we are out with a group or just eating something from home in the break room. I do not want to keep giving her bites but I also do not want to appear petty or selfish. Should I just suck it up and share, or find a way to make her stop?