Preheat the oven to 350℉.
In a large bowl, gently combine the apples, blackberries and sugar.
Whisk together the lemon juice and starch. Add this mixture to the fruit and gently stir with a spatula.
Pour the fruit into a baking dish and set aside to make the topping. I use an 8" x 10" baking dish.
In a medium bowl, combine the flour, oats, brown sugar, cinnamon, nutmeg and salt. Stir the ingredients to combine.
Cut the butter into small squares and add to the topping mixture. I use my fingers to combine the butter with the dry topping ingredients. Continue until the mixture is like the size of small peas.
Mix in the almonds.
Sprinkle the topping evenly on top of the fruit.
Bake for 35-45 minutes until the top is golden brown and the fruit is bubbling.
Serve warm or at room temperature.