Reuben with caramel

1 lb refrigerated bread dough (Use Recipe Almost No-Knead Rye Bread ) 1/4 cup thousand island dressing 6 ounces thinly sliced deli corned beef 6 ounces swiss[...]

2 tablespoons vegetable oil 1 medium onion , finely chopped 1 garlic clove , minced 1 cup chopped corned beef 2 large potatoes , washed and dried 1/4 cup milk[...]