In A Small Bowl, Combine The Mayonnaise, Lime Juice, Mustard And Lime Peel; Cover And Refrigerate Until Serving. In A Bowl, Combine The Onions, Yogurt, Jalapeno, Salt And Pepper. Crumble Meat Over Mixture And Mix Well. Shape Into Eight Patties. Pan-Fry, Grill Or Broil Until Meat Is No Longer Pink. Serve On Buns; Top With Cheese And Mayonnaise Mixture.