Preheat oven to 350F. Mix flour, salt, pepper & sugar in a large bowl or food processor. Add oil & blend until the mixture resembles coarse breadcrumbs. Combine water & lemon juice in a small bowl. Blend it into the flour mixture. Add up to 1/4 c more water if necessary. The dough should hold together. Divide dough into 2 equal portions. Roll each portion into a rectangle as thinly as possible. Using a spatula, rolling pin or your hands, pick up the rolled dough & transfer to an ungreased cookie sheet. Score into 2" squares, taking care not to cut all the way through. Prick each square with a fork. Bake 15 to 20 minutes, turning over after 10 minutes or when the edges begin to brown. Cool on a rack. Break into individual crackers. Serve with soups, dips & stews.