Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Line baking tray with baking paper. Clean and wash spring onions and cut into small rolls. Grate cheese. Coarsely chop the walnuts.
Mix cheese and nuts together with the other ingredients (except ham and 100 g butter) to a coarse crumbly dough. Stir in spring onions briefly.
Dough is a little dry? Everything done right! Put the dough on a lightly floured work surface and form a round 2-3 cm high circle with floured hands. Place the scone on the baking tray and mark with a knife approx. 8 pieces of cake approx. 1 cm deep (do not cut through completely).
Bake in a hot oven for about 25 minutes until golden brown. Cool on a cake rack for about 10 minutes. Serve with ham and remaining butter.