Take out stems of strawberries. Using a small knife, cut out centres; pipe Nutella into strawberries.
Use a toothpick each side of each strawberry. Holding toothpick, (be quick) dip stem end of strawberry into melted chocolate; allow excess to drip off. Sprinkle with hazelnuts or whatever you prefer; place strawberries on a waxed paper-lined baking sheet, point side up. Remove toothpicks; refrigerate strawberries until set - doesn't take long.