In a large mixing bowl, add the flour, sugar, baking powder, cream of tartar, vanilla powder, and salt. Whisk to combine.
Add the butter and cut into the dry ingredients, until the mixture resembles cornmeal.
Add the milk. Mix lightly until the mixture comes together. Knead about 15 times. Do not overknead.
Scoop into a greased tray lined with baking paper.
Make the glaze. In a saucepan over medium heat, add the butter, honey, and malt syrup if using.
Bring the mixture to a boil, and remove from heat.
Preheat the oven to 230 degrees C (fan 210 degrees C).
Glaze the biscuits with the honey butter mixture.
Bake in the oven and bake, until golden brown, 10 to 12 minutes.
Remove from the oven. Brush the baked biscuits with another layer of the glaze.
Serve warm.