Filter if node is referenced

I don't think a way to filter this exist, but I wanted to throw this out here to see if someone can lend me a hand in how to handle this.
I'd like to be able to filter a list of nodes based on if another node type has referenced the node. I've got a database of restaurants (food node type) and there are coupons (coupon node type) that reference the restaurants. What I am after is a way to filter a list of the restaurants by if there is a coupon for it. I can write the sql statement for the scenario but I'm not sure how to tell the views module to filter that way.

Thank you,

Mike