Mix all ingredients except the breadcrumbs. Let the mixture swell for at least 30 minutes. Blend the breadcrumbs finely. Set the griddle or frying pan to the lowest heat. Melt butter and gently sift the ground breadcrumbs into the pan.

Scoop out balls of the mixture with an ice cream scoop, dipping the scoop in water between each scoop to prevent sticking. Dip a spatula in water or melted fat and gently press each ball to form a patty shape.

Lightly sift more breadcrumbs on top and fry on low heat. Turn carefully.

Serve with mashed potatoes, peas, lingonberry jam, and browned butter.