You had us at double-decker and goat cheese. (#ProTip: you may want to have a knife handy to cut this burger in half.)
Ingredients: 3/4 pound ground chuck, about 80 percent lean 3/4 pound ground sirloin, about 90 percent lean Vegetable oil Salt and freshly ground pepper Goat cheese 4 kaiser rolls or hamburger buns, split and toasted Grilled Chile Relish
1) In a bowl, mix the ground meats. Form the meat into 8 patties and grill for 2 minutes per side.
2) Top 4 of the patties with a disk of goat cheese, some of the Grilled Chile Relish and another burger.
For the Grilled Chile Relish: 4 poblano chiles 4 Anaheim chiles 1 large sweet onion, sliced 1/2 inch thick Vegetable oil 1/4 cup light brown sugar 1/4 cup each of whole-grain mustard and Dijon mustard 2 tablespoons cider vinegar Salt and freshly ground pepper
1) Rub chiles and onion with oil and grill until charred, 8 minutes. Peel and seed the chiles and cut into thin strips; chop the onion.
2) Transfer the vegetables to a saucepan. Add the remaining ingredients and bring to a simmer over moderate heat, then serve.