Perfect for breakfast or brunch on a cool morning; this dish is just gorgeous served with natural yogurt and a drizzle of honey.
Preheat oven to 180C.
For the crumble, combine the butter, cinnamon, vanilla, flour, salt and sugar in the bowl of a food processor and pulse for a few seconds.
Tip into a big bowl and add the oats, stir to combine.
Arrange the apples so they cover the base of a large, deep roasting tin.
Pour over the verjus and dot the top of each apple with a small nob of butter and sprinkle with the sugar. Cover the tray with a tight layer of foil and roast for one hour.
Remove foil, top with the crumble and bake for another 30 minutes or until golden and crunchy. Serve warm with honey and yoghurt.