In a bowl, combine sauce ingredients. Place in refrigerator to chill. Prepare grill or griddle. Boil Potato in water over medium heat until tender, about 10 minutes. meanwhile, combine remaining ingredients in a medium bowl. Drain Potato and mash with a fork or masher. Add Potato to bowl, mix well and form into 4 thin patties. If Potato mixture is too dry to hold together, add a little water before making patties. Grill patties 4 to 5 minutes. on each side until lightly browned. Serve on hamburger buns with sauce and your choice of fixings. I don"t have a grill so i broiled mine instead and they turned out great! brown and crispy! these have a nice taste