Supreme Irish Soda Bread  (Sweet!)

I got this recipe from my Grandma Olive.

Ingredients:
  3 cups regular flour
  2 beaten eggs
  3 teaspoons baking powder
  1/2 teaspoon baking soda
  1 cup sugar
  3 teaspoons butter
  1 cup raisins
  1 cup sour milk (make this with regular milk and 1 teaspoon vinegar)

Directions:
  Preheat oven to 300 degrees.  Mix everything well, adding flour last,
  one cup at a time.  Use a big, strong mixing spoon, as the dough will
  be stiff toward the end.  Pour into greased baking pan.
  Bake at 300 degrees for 1.5 hours.  Turn off the oven, and leave the
  bread in for another half-hour.

  Served fresh, this bread is moist and needs no spread.  Any other
  time, a bit of melted butter or margarine on top pleases my palate.