Step 1: Preheat your oven to 425°F (220°C).
Step 2: In a large mixing bowl, combine the flour, salt, cream of tartar, baking powder, and sugar. Whisk until well blended.
Step 3: Add the shortening to the dry mixture and cut in until it resembles coarse crumbs.
Step 4: Pour in the milk and stir gently with a fork until the dough comes together.
Step 5: Turn the dough out onto a floured surface and knead gently. Pat into a rectangle about 1/2 inch thick.
Step 6: Cut into rounds or squares and place on a baking sheet lined with parchment paper.
Step 7: Bake for 12-15 minutes or until golden brown.
Step 8: Let cool on a wire rack for a few minutes before serving.
