Put the apples, sugar and lemon juice in a pot over low heat and steam until just a little cooked (they should still be firm). Add the persimmons.
Mix the corn starch with a little water, just so it mixes to a liquid and then stir into the fruit in the pot.
Pour the fruit into an 8 x 8 baking pan (ceramic or glass is best for this type of dessert).
Make the crumble topping by rubbing the the stick of butter into the flour with your fingers, until all that you have are crumbs. Stir in the sugar, then sprinkle on top of the fruit, and spread evenly.
Bake in preheated oven for approximately 25 minutes or until top is golden brown. Remove from oven.
Next, put all the ingredients for the rum sauce, except for the dark rum and baking soda, in a small pan over medium heat. Stir and bring to a boil, then lower heat and simmer for a few minutes, before adding the rum and baking soda. Remove from heat and continue to stir until well mixed.
Once the crumble has cooled a little, serve with warm rum sauce.
Notes
Refrigerate any leftovers of the dessert and/or sauce. If, there are any leftovers!
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