In a bowl, take the condensed milk, add melted butter, fresh mosambi juice, orange marmalade, and blend well.
Next, add the baking powder and baking soda, whisk and let it stand for 5 mins. Then, add the flour and gently fold in.
Preheat the oven at 185 C. Line a baking loaf with parchment paper. Pour the batter into the tin and pat it down. The batter will be on the thicker side, so using a spatula scoop into the baking tin.
Bake for 30 mins at 185 C. Then, bake at 170 C for 10 mins.
Let it stand for 10 minutes before slicing.