The cooked sponge will feel slightly undercooked, that's quite normal as the fruit lets out moisture when it cooks and defrosts.
This dish is not only a hot pudding, also cold as a nice cake with vanilla ice cream.
Any frozen fruit bags are nice here. The frozen pineapple chunks make a good upside down cake.
This sponge uses olive oil rather than butter, so cutting down on the saturated fat.