Heat the oven to 350°F/175°C. Grease the pan and line the sides and bottom with wax paper. Sift together the flour, cinnamon, baking powder, baking soda and salt, removing one tablespoon to toss with the walnuts in a small bowl. Set aside.
Lightly beat the eggs and sugar in a large bowl until just mixed. Stir in the melted butter or margarine, and honey. Stir t