Preheat oven to 450

line a baking sheet with parchment paper

in bowl combine flour,cream of tartar, baking soda and salt

cut in cold butter w a pastry blender

mix will resemble coarse crumbs with no large chunks of butter if butter gets soft refrigerate for 20 min

add 1/2 c buttermilk stirring just to moisten ingredients

dough should be soft and moist add remaining 1/2 cup as needed

turn dough on a lightly floured surface and kneed gently about 10 times or just until dough holds together

roll or pat dough into a rectangle

with short side nearest u spread top 2/3 of dough with softened butter leaving bottom 1/3 unsalted

fold dough into thirds like u would fold a letter pull botton third over the middle and then top third over middle

turn dough so short side faces u

pat into a rectangle

in same manner spread w butter and fold letter style

turn once more

pat into a rectangle spread w butter and fold like a letter

work quickly and gently

pat dough into a rectangle 3/4 inch thick on floured surface

cut into squares

place into pan 1 inch apart

lightly brush tops w melted butter

bake for 20 min until golden brown