01 -
Heat the oven to 180°C / 350°F. Lightly butter a 23 cm square baking dish using a little of the measured butter.
02 -
Cut the apples into 1 cm pieces. Toss with lemon juice, 30 g brown sugar and 1 teaspoon cinnamon, then spread in the dish.
03 -
Combine flour, oats, the remaining 50 g sugar, remaining ½ teaspoon cinnamon and salt. Rub in the cold butter with your fingertips until small clumps form.
04 -
Scatter the crumble loosely over the apples without pressing it down.
05 -
Bake for 35–45 minutes until golden and the fruit bubbles at the edges. Pierce the fruit in the centre with a knife to check that it is tender.
06 -
Rest for 15 minutes before serving. Cool leftovers promptly and refrigerate within two hours for up to three days.