Set the temperature of the oven to 450 F (230 C). Make a baking sheet by covering it with parchment paper.
In a big bowl, mix the sugar, self-rising flour and salt together.
Add the cold butter cubes to the flour mix. You can use your finger or pastry cutter to mix the butter into the flour until it looks similar to small crumbs. Aim for pea-sized pieces of butter spread out in the flour.
Make a hole in the middle of the flour mixture and add the buttermilk. Stir with a help of spoon or fork until a soft dough forms. Make sure to avoid mix too much, the dough should be bit sticky.
Place the dough on a surface with flour. Now, add little bitextra flour on the top of dough and gently press to a rectangular shape about ½to ¾ inch thick.
You can either use a biscuit cutter or a floured glass to cut out biscuits from the dough. Press down to make the neat edges without twisting. Place the bisuit on the baking sheet by keeping them one inch apart.
Collect the leftover dough scrap, and press them together to prepare more biscuits.
Bake the biscuit in the oven until they’re tall and turn golden brown on top, it may take around 10-12 minutes.
Take out the biscuits from the oven and allow them cool on a baking sheet before serving.