Preheat the oven to 200C/gas mark 6/400ºF. Put the hulled strawberries into your pie dish, I use a round ovenproof pie dish approx. 21cm diameter x 4cm deep (approx. 1.25 litre capacity) / 8 inches diameter x 2 inches deep (approx. 1¼ quarts capacity), and sprinkle over them the sugar, almonds and vanilla extract. Give the dish a good shake or two to mix the ingredients.
Now for the crumble topping: put the flour and baking powder in a mixing bowl and rub in the cold, diced butter between thumb and fingers (or in a freestanding mixer). When you've finished, it should resemble rough, pale oatmeal. Stir in the flaked almonds and sugar with a fork.
Tip this over the strawberry mixture, covering the strawberries in an even layer and giving a bit of a press in at the edges of the dish. Set the dish on a baking sheet and bake in the oven for 30 minutes, by which time the crumble topping will have darkened to a pale gold and some pink-red juices will be seeping and bubbling out at the edges.⏱ 30 min
Leave to stand for 10 minutes before serving, and be sure to put a jug of chilled double cream on the table alongside.⏱ 10 min