Preheat oven to 350℉ / 180℃ / 160℃ Fan (convection). Butter and flour the inside of a 9x5-inch loaf pan and line the center with overhanging parchment paper.
Whisk together the flour, baking powder, and salt in a medium bowl. Set aside.
250 grams all purpose flour , 3/4 teaspoon baking powder, 1/2 teaspoon fine sea salt
Combine the granulated sugar and orange zest in a large mixing bowl. Massage the zest into the sugar with a fork until the sugar has started to absorb the orange oils.
200 grams granulated sugar, zest of 3 large oranges
Next, add the eggs to the sugar and using an electric hand mixer, whisk together for about 2 minutes on medium speed, until thicker and paler in consistency.
3 large eggs
Add in the heavy cream, vanilla, almond extract and marmalade then mix again to distribute.
180 grams heavy cream, 1 vanilla bean pod split and seeds scraped, ½ teaspoon almond extract, 1 tablespoon orange marmalade jam
Pour in the oil slowly while continuing to mix.
125 grams sunflower oil
Add the dry ingredients into the liquid mixture and fold with a silicone spatula until no flour streaks remain.
Pour the cake batter into the prepared loaf pan.
Place the pan on the middle oven rack and bake for 50-55 minutes or until a toothpick inserted into the center comes out clean.
Make Orange Syrup & Glaze Cake
While the cake is baking, make the orange syrup. Place the sugar and orange juice in a small saucepan on medium heat until the sugar dissolves. Remove from heat and set aside.
100 grams granulated sugar, 100 grams fresh orange juice
Once the cake is baked, place it on a wire rack to cool. Immediately glaze the top of the warm cake, by painting with a thin coating of orange syrup using a pastry brush.
Let the cake cool for 15 minutes before removing it from the loaf pan. Transfer the slightly warm cake to a serving dish and brush the sides with a thin coating of orange syrup.
Flour: Gold Medal all Purpose Flour 10.5-11% protein
Oven: This recipe was written for a conventional oven (top and bottom heat). For convection fan ovens, reduce the temperature by 25 degrees and begin checking for doneness 75% of the way through baking.