Mix pork, breadcrumbs, egg, sour cream, salt and pepper in a bowl.
Roll the mince mixture into balls, using around 2 tablespoons of mince mixture for each ball.
Heat oil in a frying pan on medium-high heat, add rissoles and slightly flatten them with a spatula (or a hand if you are brave enough).
Brown each side of the rissole, then cover the pan with the lid. Reduce the heat and let them cook for around 5-7 minutes or until cooked through.