Heat oven to 180C/160C fan/gas 4. Slice off the top of each roll, then gently remove the bread inside until there is a hole large enough to accommodate a slice of salmon and an egg. Arrange the rolls on a baking sheet, reserving the tops. (If you like, whizz the middles into crumbs and keep in the freezer for another recipe.)
Brush the inside and edges of the rolls with a little melted butter, then arrange a slice of salmon inside each one. Crack an egg into each and season. Bake for 10-15 mins or until the eggs are cooked to your liking. Scatter with snipped chives. Toast the tops, brush with the remaining butter, then cut into soldiers and use to dip into eggs.