Preheat your oven to 180 / Gas Mark 4). Lightly grease and line a 20cm round tin or line a baking sheet.
In a large bowl, cream together the Langage Farm Clotted Cream and caster sugar until light and fluffy.
Sift in the plain flour, rice flour, and salt. Mix everything with a wooden spoon (or your hands!) until a soft dough forms. Don’t overmix!
Press the dough evenly into your prepared tin or roll it out to about $1\text{cm}$ thick on a lightly floured surface and cut into rounds or fingers.
Prick the surface all over with a fork.
Bake for 20-25 minutes until it’s a lovely light golden colour.
While still warm, cut the round shortbread into wedges and sprinkle generously with extra caster sugar.
Let it cool completely in the tin/on the tray—it will firm up as it cools.