Found a staple in my steak from a restaurant. Can I sue?

Ordered food from a restaurant, when it arrived I started eating. When I put the second bite of steak in my mouth I felt something pinch me, thinking it was a piece of cartilage I moved it around my mouth to slide it out. It was then I tasted the metal. I pulled out a flatten, long whole staple. Called the restaurant immediately, they only offered a refund of my steak- I accepted but haven't seen anything. It has since been hard for me to even by food thinking there will be something inside it.