In a mixer, lightly beat eggs and sugar until thickened.
Sift together flour, baking powder and salt, and fold into egg and sugar mixture.
Follow with mashed and thinly sliced saba. Stir to turn mixture into a smooth batter.
Heat oil in skillet. Fry patties of maruya until golden brown and crisp.
Make sauce by melting butter in saucepan.
Combine cream and brown sugar and add into melted butter.
Stir until thick and smooth. Let cool and add rum.
Pour sauce over warm maruya and serve.