Preheat oven to 220°C (428°F). Line a baking tray with baking paper.
In a large bowl, whisk together flour, sugar, and salt.
Rub in the grated coconut oil with your fingertips until the mixture resembles coarse breadcrumbs.
Stir in the soy yoghurt and vanilla extract until a soft dough forms.
Gradually add the sparkling lemonade, just enough to bring the dough together without overmixing (it should be slightly sticky).
Turn the dough onto a lightly floured surface and gently knead 5-6 times to form a smooth ball.
Pat out the dough to a thickness of about 2cm.
Use a 6cm round cutter to stamp out scones, re-rolling scraps as needed.
Place scones on the prepared tray and brush tops with milk (optional, for a golden crust).
Bake for 15-20 minutes, or until golden brown and firm to the touch.
Cool slightly on a wire rack, then devour warm with your favourite vegan jam and whipped cream!