mixer set on medium speed, until well blended. Add the flour, cottage cheese, vanilla, and salt, beating until smooth. Add the eggs, one at a time, beating well after each addition. Blend in the milk. Pour the pineapple mixture into the unbaked pie shell and then gradually pour the cottage cheese mixture over the pineapple layer, being careful not to disturb the first layer. Bake at 450 degrees F. for 15 minutes, then reduce the temperature to 325 Degrees F. and bake for 45 minutes more, or until a knife inserted halfway between the center and edge comes out clean. Cool on a wire rack and serve at room temperature.