Nigerian meat pie

For the Nigerian Meat Pie dough 1kg (8 cups) plain flour (All Purpose Flour) 2 teaspoons baking powder 500g (1.1 lbs) Margarine 2 pinches salt ½ cup / 125 ml / 4.2 oz cold water

For the Nigerian Meat Pie filling 2 medium Irish potatoes 2 medium carrots 500g (1.1 lbs) minced meat 1 medium onion 2 cooking spoons vegetable oil 2 Knorr cubes 1 teaspoon thyme 2 tablespoons plain flour 1 cup / 250 ml / 8.4 oz cold water Salt to taste