Heat oven to 350º F. Lightly coat loaf pan with vegetable cooking spray.
In a bowl, stir together the flour, sugar, walnuts, baking powder, rosemary, salt, and lemon zest. In another bowl, blend the eggs, wine, and olive oil; stir into the dry ingredients. Transfer the batter into pan and smooth surface. Bake 55 minutes or until a skewer inserted in the center comes out clean.