Creating this dessert is straightforward if you follow these simple steps:

For the Crumble:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Fruit: In a mixing bowl, combine the chopped apples and pears. Add the granulated sugar, cinnamon, and lemon juice, then gently mix to coat the fruits evenly.
3. Transfer to Baking Dish: Spread the fruit mixture into a greased baking dish, ensuring an even layer.
4. Prepare the Crumble Topping: In another bowl, mix the rolled oats, flour, salt, and diced butter. Using your hands or a pastry cutter, mix until the mixture resembles coarse crumbs.
5. Assemble the Crumble: Evenly sprinkle the crumble topping over the fruit layer in the baking dish.
6. Bake the Crumble: Bake in the preheated oven for 40-45 minutes or until the topping is golden brown and the fruit is bubbling.
7. Cool Slightly: Once baked, remove it from the oven and let it cool for about 10 minutes.

For the Basil Sorbet:

1. Make a Sugar Syrup: In a small saucepan, combine water and sugar over medium heat, stirring until dissolved. Allow it to cool slightly.
2. Blend the Ingredients: In a blender, add the fresh basil leaves, cooled sugar syrup, lemon juice, and a pinch of salt. Blend until smooth.
3. Chill the Mixture: Transfer the mixture to a bowl and place it in the freezer for at least 4 hours or until firm. For best results, stir every hour to break up any ice crystals.