Turkey Cheddar Burgers

Directions

1. Put oven rack in middle position and preheat oven to 350 F.
2. Cook shallots in oil with ¼ tsp salt and pepper in an 8-inch skillet over moderate heat, stirring occasionally, until golden, 2 to 3 minutes, then transfer to a bowl.
3. Add turkey to bowl and mix gently but thoroughly.
4. Divide turkey mixture into eight equal mounds and place on wax paper.
5. Pat one mound into a 4-inch patty and top with a pinch of cheese, then put a second mound on top, patting it onto other patty to enclose cheese. Pinch edges together to seal and shape into a single patty.
6. Make three more burgers in same manner.
7. Heat an oiled, well-seasoned ridged grill pan over moderately high heat until hot but not smoking. Grill burgers, turning over once, until just cooked through (no longer pink), 8 to 9 minutes total.
8. While burgers are cooking, purée tomatoes with water, vinegar, and reserved salt in a blender or food processor, scraping down sides as necessary, then blend in mayonnaise.
9. Spread tomato mayonnaise on lettuce and place burger patty on top. Serve and enjoy!