1. Preheat oven to 350 degrees F. Grease, line with paper and grease again a 10 x 10-inch pan.
2. Add 1 tablespoon of the flour to the dates and mix with fingers until dates are coated and mixed with nuts. Set aside.
3. Beat eggs, add sugar gradually and beat until fluffy. Sift together the remaining flour, baking powder and salt. Add to egg mixture and stir until well mixed. Stir nuts and dates into the batter.
4. Spread into prepared pan and bake for 20 minutes, or until cake rebounds to the touch when pressed gently in the center. Cool slightly, turn out of pan and cut into bars 1 x 2-1/2 inches each.