To make the cake, start by preheating the oven to 180C. Grease a 23cm x 13cm loaf tin with butter and line the sides with baking paper. Set aside.
In a large mixing bowl, add the sugar, orange zest and rosemary. Using your fingertips, rub the zest and rosemary into the sugar until moist and fragrant. Add the olive oil, eggs and orange juice, and whisk until combined.
150 g granulated sugar, Zest from 3 oranges, 1 tablespoon rosemary, 240 ml olive oil, 3 eggs, 180 ml fresh orange juice
Add the flour, baking powder and salt, and fold gently but quickly until just combined and smooth. Don’t over mix.
280 g flour, 1 teaspoon baking powder, ¼ teaspoon salt
Pour the batter into the prepared loaf tin and bake for 50-60 minutes, or until a metal skewer inserted into the centre comes out clean.