Cut a banana in half and wet it with lemon juice.
Mix the dry ingredients: flour, sugar, yeast.
Mix the liquid ingredients: the mashed banana with the cold melted butter, the egg, the milk.
Combine the ingredients together, add the cinnamon powder and mix.
Butter the mould with a dusting of flour.
Pour the mixture into the mould.
Place the banana cut in half on the mixture in the mould.
Bake for 45 min at 170 °C.
Check the baking with the toothpick test, it must be dry. The baking of the plumcake will be homogeneous, both inside and out.