Clean the herrings.
Mash up the roes with a fork (they may be hard or soft ones), mix with the bread soaked in milk, 1 tablespoonful of mixed herbs and the shallot, very finely chopped.
Beat 2 tablespoonfuls of butter into this mixture, season; stuff the herrings with it.
Grease a fireproof dish amply using 2 tablespoonfuls of butter; sprinkle with the rest of the mixed herbs; place the stuffed herrings on this, sprinkle with breadcrumbs, and 4 tablespoonfuls of melted butter.
Bake in the oven for 20 to 25 minutes, basting frequently with the melted butter.