Peel, core, and cut the apples into even chunks about ¾-inch wide.
Toss the apples with lemon juice, granulated sugar, salt, and cinnamon until evenly coated.
Pack the apples tightly into a baking dish and cover with foil.
Bake the apples until they shrink and release juices, about 30 minutes.
In a bowl, mix flour, brown sugar, salt, cinnamon, and chopped almonds.
Stir in melted butter, vanilla extract, and water until the topping becomes crumbly and lightly clumps when pressed.
Remove the foil and evenly sprinkle the crumble topping over the apples, breaking up large clumps.
Bake uncovered for 25–30 minutes, placing the dish higher in the oven for better browning.
Remove from the oven when the topping is golden and the juices bubble at the edges.
Let the crumble cool for 30–45 minutes before serving so the filling sets properly.