1/3 c coarse ground cornmeal
2 c water
4 c flour
2 tsp salt
1 tsp baking powder
1 TBS butter (or margarine) + additional
Combine corn meal & water in medium heavy saucepan, place over medium heat. Bring to rapid boil, stirring constantly. Set aside to cool to luke-warm temperature (you will be mixing this with your hands, you do not want it too hot to touch).
Combine flour, salt and baking powder in large mixing bowl, stirring gently with wooden spoon to combine. Cut in butter, mixing gently with hands until worked throughout. Spoon cornmeal evenly into flour mixture, mix quickly but gently with hands until a rough dough forms. Gather into 1 large lump and rub outside thoroughly with butter. Pinch off small amount (golfball size clumps) and roll into balls; dip lightly in flour & roll to cover. Let stand for 15 minutes, lightly covered with cloth towel.
Preheat heavy griddle over medium heat (or electric to 350). Working with one ball at a time, flatten dough ball into disc shape. Plunk onto lightly floured surface; using rolling pin, roll lightly from middle, turning dough after each roll, until desired thickness. Cook on griddle, flipping when tortilla begins to "bubble". Cook until done. Stack & wrap in cloth until cool.