Peel and grate 500g carrots. Finely chop 250g nuts (pecans or walnuts). In a separate bowl, mix 250g whole wheat flour, 2 teaspoons baking soda, 2 teaspoons cinnamon, 200g sultanas, and 300g brown sugar.
Preheat oven to 180°C (350°F), or 160°C (320°F) if using convection mode. Grease a deep baking sheet with oil.
In a bowl, beat 4 eggs until frothy. Gradually stir in 250ml vegetable oil while beating. Add the grated carrots and chopped nuts to the egg-oil mixture, then combine with the dry ingredients until smooth.
Spread the batter evenly onto the prepared baking sheet. Bake for 40-50 minutes at 180°C (350°F), or 160°C (320°F) if using convection mode, until a toothpick inserted in the center comes out clean.