Heat the oven to 200C/180C fan/gas 6. Melt the butter in a small pan, then leave to cool slightly. Tip the oatmeal, flour, baking powder, parmesan and sesame seeds, if using, into a bowl with 1/2 tsp salt, then pour in the melted butter. Add 5 tbsp boiling water and bring together into a firm dough, adding another 1 tbsp boiling water if needed.

Turn the dough out onto a lightly dusted work surface, then roll out to the thickness of a £1 coin. Cut into small squares or 3-4cm triangles, then transfer to a lined baking sheet. Re-roll any offcuts and repeat. Bake for 12-15 mins until golden. Leave to cool for a few minutes on the baking sheet, then transfer to a wire rack and leave to cool completely. Serve with soft cheese and grapes, if you like.