“Swiss cheese, crispy onion straws, French Onion spread and tomatoes on a melted Provolone-capped onion bun, topped off with three golden-fried onion rings.” Why did it take so long for Red Robin to come up with its limited-time French Onion Ringer Burger? After all, the onion rings, onion straws, and cheeses were there in the kitchen anyway. And it wasn’t a big stretch to think of piling them on the fluffy white-flour buns.