For the sauce, peel and finely dice the onion. Peel garlic and chop finely. Heat olive oil in a small pan and sauté onions and garlic. Add tomato paste, sweat it and deglaze with tomatoes.
Add oregano. Season with salt, pepper, sugar and paprika and simmer for 3-4 minutes, remove from heat.
Clean and wash spring onions and cut into fine rings. Grate the cheddar roughly. Whisk buttermilk and eggs. Mix flour, baking powder, baking soda and cheddar in a mixing bowl. Cut butter into cubes and add to the flour mixture.
Rub quickly with the fingertips to a coarse crumbly dough.
Stir in the buttermilk egg mixture and about half of the spring onions briefly. Stir only briefly until a dough is formed. Line a baking tray with baking paper and dust thinly with flour. Put the dough on top and form a circle (34 cm Ø) with floured hands.
Finely grate the raclette cheese. Spread tomato sauce evenly on the scone. Cover with salami, sprinkle with remaining spring onions and raclette cheese. Scone in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see
manufacturer) bake on the bottom rack for 35-40 minutes.
Remove from the oven and leave to rest on a grid for 5-10 minutes. Garnish with oregano leaves if desired.