Roast isterband korv at 200°C (400°F, gas 6) for about 25 minutes, turning once or twice to ensure that they are evenly browned. (Line the tray with foil, to make it easier to dispose of the melted fat that is released.) The sausages can be fried if you prefer.
Ister means lard and band comes from att binda (to bind), so isterband means bound lard. Don’t let that put you off as all sausages contain lard or pork fat, which melts during the cooking process, distributing the heat evenly and adding to the flavour. In contrast, low fat sausages have less flavour and are harder to cook because the contents are very insulating leading to the outside browning before the inside is cooked.
Of course, lard was added to sausages for another reason: it is cheap! As a famous Smålander, Ingvar Kamprad, the founder of IKEA (despite his vast wealth, was renowned for his devotion to frugality) put it in an interview in 2016 “it is in the nature of Småland to be thrifty”.