4 cups flour
1 cup butter (or margarine)
3/4 cup milk
1 teaspoon vinegar
1/2 teaspoon baking soda
1/2 teaspoon salt
Work the butter into the flour with a pastry cutter or fork. Next, stir the vinegar, baking soda, and salt into the milk, and add this to the butter-flour mixture.
Form the dough into a ball. Roll out very thin. Lightly score the dough in the size of the cracker you desire. (Sometimes I make squares, sometimes diamonds. I think you could cut out the crackers with cookie cutters for special occasions, but you will have a lot of waste unless you gather up the fragments and re-roll and re-cut them.)
Now bake the crackers at 375F for about 10 to 15 minutes or until crisp. The crackers should not get too brown, just a sprinkling of brown on top.